Are you running into issues with your combi boiler? Read our guide on common combi boiler problems and how to fix them to restore order to your home.

<p><a href="https://www.boxt.co.uk/boilers/combi-boilers" rel="follow">Combi boilers</a>, sometimes known as combination boilers, are among the most popular home heating systems in the UK. They&rsquo;re energy-efficient, affordable, and compact, making them ideal for large numbers of households nationwide. &nbsp;</p>
<p>Combi boilers offer a wealth of advantages, but like any appliance, they are susceptible to the odd mishap.</p>
<p>If your home's boiler or central heating system isn&rsquo;t working as it should, it can feel like the end of the world, but don&rsquo;t worry&mdash;help is at hand.</p>
<p>In this guide, we&rsquo;ll help you troubleshoot some of the most common combi boiler problems so that you or your engineer can get things back up and running as soon as possible.</p>
<h2>The most common combi boiler problems</h2>
<p>Below are some of the combi boiler problems our engineers often encounter.&nbsp;</p>
<p>In most cases you will need to contact a Gas Safe registered engineer who&rsquo;ll be able to come and investigate.</p>

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<h3>No hot water</h3>
<p>Finding yourself without hot water is one of the most common (but most irritating) combi boiler issues people encounter. This can present itself in a few different ways, which we'll go through below.</p>
<h4>1. There is no hot water, but the central heating is working</h4>
<p>Sometimes, your home's central heating will work as usual, but hot water won&rsquo;t come from your taps.&nbsp;</p>
<p>In this scenario, The two things listed below, amongst many others, could be causing this problem.&nbsp;</p>
<ul>
<li><strong>Faulty diverter valve</strong>: In a combi boiler, the diverter valve directs hot water to the taps or the central heating system. If the valve isn&rsquo;t working as it should, it may not switch to the hot water mode when required.</li>
<li><strong>Scale/magnetite buildup</strong>: Over time, the accumulation of scale or magnetite in a combi boiler&rsquo;s plate heat exchanger could restrict or even block the flow of water through it, which would cause the boiler not to produce hot water and potentially overheat.</li>
</ul>
<p>For any of the potential causes listed above, you must <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">contact a Gas Safe registered engineer</a> to come and take a look.</p>
<h4>2. There is no hot water and no central heating</h4>
<p>Here are some likely causes of no hot water or central heating in your home:</p>
<ul>
<li>Loss of water pressure: A considerable loss of water pressure in the system can prevent the boiler from operating for both hot water and central heating. If there isn&rsquo;t enough water, it won&rsquo;t be circulating in the home and safety devices in modern boilers will prevent it from lighting to protect the boiler.</li>
<li>Faulty programmer or timer switch: A malfunctioning programmer or timer switch may not signal the thermostats or boiler to produce hot water or activate the central heating.</li>
<li>Ignition issue: Problems with the boiler's ignition system or electronic controls can prevent it from firing up for hot water or heating.</li>
</ul>
<p>To resolve these issues, you can try a manual reset by following the manufacturer&rsquo;s instructions or&nbsp;<a href="https://www.boxt.co.uk/boilers/guides/boiler-pressure" rel="follow">repressurising your boiler</a>. If neither of these fixes gets things back up and running, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">contact a Gas Safe registered engineer</a>, who can investigate further.</p>
<h4>3. There is hot water, but only when the heating is on</h4>
<p>If your combi boiler only produces hot water when the heating is on simultaneously, there will likely be an error.</p>
<p>Here are the main ones to look out for:</p>
<ul>
<li>Faulty diverter valve: As mentioned, this valve directs hot water to the heating system or the domestic hot water supply, depending on the user's selection. If the diverter valve is faulty or stuck, it may not move into the hot water position when required.</li>
<li>Faulty thermistor: If it is defective or malfunctioning, it can impact the boiler's ability to produce and deliver hot water on demand.</li>
</ul>
<p>Unfortunately, neither of these are DIY fixes. Contact a Gas Safe registered engineer to ensure your combi boiler&rsquo;s fault is investigated and repaired safely.&nbsp;</p>
<h3>Water leaking</h3>
<p>If your combi boiler leaks, you might first notice a drop in the water pressure in your system. When you look at the combi boiler, you might see a puddle forming or a stain beneath the appliance where water has gathered and dried.</p>
<p>Leaking water can indicate that internal components within the boiler are damaged and need replacing, such as the boiler's hydraulic blocks, O rings, seals and gaskets. Alongside this, leaking water out of your blow off pipe outside could mean you have a faulty pressure relief valve or issues with your boiler&rsquo;s expansion vessel.</p>
<p>If water is leaking from your boiler, the whole system must be inspected. These repairs are technical and can require specialist equipment, meaning you must <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">contact a Gas Safe registered engineer</a> rather than trying to carry them out yourself.</p>
<h3>No pilot light</h3>
<p>If you have an older combi boiler that fails to ignite or shows signs of intermittent heating, there may be an issue with the pilot light. You can sometimes see your pilot light from outside your combi boiler via a sight glass.&nbsp;</p>
<p>The boiler's pilot light could be struggling to light for several reasons, including an issue with the gas supply or a blocked/dirty pilot burner assembly.</p>
<p>A Gas Safe registered engineer must investigate any combi boiler issues relating to gas supplies or faulty ignitions.&nbsp;</p>
<h3>Thermostat error</h3>
<p>If your combi boiler isn't responding to changes you're making on your room thermostat, there could be an error with your home's wireless network, or if you have a hard-wired thermostat, the thermostat itself could be faulty. Another telltale sign of a thermostat error is inaccurate temperature readings from the system and uneven heat distribution around the home.</p>
<p>The causes of a thermostat error can be things like incorrect wiring, signal loss, or boiler control board issues.</p>
<p>Here are some simple solutions that might help:</p>
<ul>
<li>Check the batteries if the thermostat is wireless</li>
<li>Reset the thermostat settings</li>
<li>Update the software</li>
</ul>
<p>If you&rsquo;ve tried the above DIY fixes and are still experiencing issues, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">get in touch with a Gas Safe registered engineer</a>. During a callout, they'll check your whole system and get to the bottom of any issues.</p>
<h3>Loss of pressure</h3>
<p>A loss of pressure within your combi boiler can cause your entire system not to heat up as it should and, in some cases, lead to what&rsquo;s known as a boiler lockout. Low water pressure can be caused by a system leak or other issues within the appliance, such as issues with the expansion vessels or pressure relief valve.</p>
<p>If you think low boiler pressure could be the cause of your boiler issue, you can check the pressure gauge on the front of the system. The needle should be sitting in the green zone between 1 and 2 bar. If your pressure is low, you can try <a href="https://www.britishgas.co.uk/the-source/fix-it-yourself/how-to-repressurise-your-boiler.html" rel="follow noopener" target="_blank">repressurising your boiler</a>.&nbsp;</p>
<p>If this doesn&rsquo;t work, you&rsquo;ll need to contact an engineer to come and take a look. They may need to repair or replace faulty components or carry out more complex maintenance on your home&rsquo;s central heating system.</p>
<h3>Strange noises</h3>
<p>Household appliances can make a selection of weird and wonderful <a href="https://www.boxt.co.uk/boilers/guides/9-reasons-why-your-boiler-is-making-a-noise" rel="follow">noises</a> as they serve your home, but sometimes, rumbles and gurgles can shed light on a more significant issue with your combi boiler.</p>
<p>If you hear bubbling and gurgling from your combi boiler, air could be trapped in the system, limescale buildup, a damaged pump, or low water pressure.</p>
<p>Because a number of different things can cause these strange noises, there are several DIY fixes you can try before <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">calling an engineer</a>, including bleeding the radiators, checking the water pressure or adjusting the temperature settings.</p>
<p>Read our full guide on <a href="https://www.boxt.co.uk/boilers/guides/9-reasons-why-your-boiler-is-making-a-noise" rel="follow">why your boiler might be making a noise</a>, or watch our troubleshooting video below for more information.</p>

center

<h3>Frozen condensate pipe</h3>
<p>If you have a modern condensing gas combi boiler, it will have a condensate pipe and flue. Sections of these pipes sit outside your property, leaving any liquids inside at risk of freezing in sub-zero temperatures. Frozen condensate pipes are a common boiler issue in the UK during the winter months.&nbsp;</p>
<p>Symptoms can include gushing sounds from the boiler, frequent lockouts and visible ice on the outside of the pipe itself.</p>
<p>If you suspect your condensate pipe is frozen, you can try to reset the system. Or, if your condensate pipe runs externally, you could try thawing it by pouring hot (not boiling) water onto it. If neither of these fixes works, contact an engineer.&nbsp;</p>
<p>Here, you can read our complete guide on <a href="https://www.boxt.co.uk/boilers/guides/how-to-fix-a-frozen-boiler-condensate-pipe" rel="follow">how to fix a frozen condensate pipe</a>.</p>
<h3>Kettling</h3>
<p><a href="https://www.boxt.co.uk/boilers/guides/boiler-kettling" rel="follow">Kettling</a> is when water begins to boil inside the boiler. Even though this might not sound like a problem, the water inside your boiler (whether it&rsquo;s combi, system or standard) should never actually reach boiling point. If it does begin to kettle, it will generate steam inside the system and, as the name suggests, cause a loud rumbling or whistling noise, just like a kettle.&nbsp;</p>
<p>In terms of symptoms, you might notice a decreased efficiency with your system. This means it may cost more to heat your home, or your boiler won't be heating up as it should. It could also mean a potential fluctuation in boiler pressure.</p>
<p>The causes for kettling can vary, but some leading causes are limescale buildup, debris or sludge in the system, incorrect pump settings or a failure causing overheating.</p>
<p>If you're experiencing kettling in your combi boiler, don&rsquo;t try and fix it yourself. <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact a Gas Safe registered engineer</a> to come and service or repair the system.</p>
<h3>Cold radiators</h3>
<p>Everyone knows that sinking feeling when you think the heating is on, but your radiators aren't warming up as they should. Maybe you can feel cold patches on the bottoms of one or more of your radiators, or perhaps certain areas of your home feel warmer than the others.</p>
<p>If your <a href="https://www.boxt.co.uk/boilers/guides/radiator-cold-at-bottom" rel="follow">radiators are cold</a>, it can mean many things. If you have cold spots towards the bottom of your radiators, then there is more than likely magnetite or sludge in them, which has settled in the bottom, preventing correct heat transfer. This will require a <a href="https://www.boxt.co.uk/boilers/guides/power-flush" rel="follow">system flush</a> to remove the sludge and resolve the issue.</p>
<p>If they are cold at the top, this will more than likely be due to air trapped in them, and they need bleeding.&nbsp;</p>
<p>If air is trapped in your radiators this can be solved by bleeding your radiators. You can learn <a href="https://www.boxt.co.uk/boilers/guides/how-to-bleed-a-radiator" rel="follow">how to bleed a radiator</a> by reading our expert&rsquo;s guide.&nbsp;</p>
<p>If you've bled your radiators and they still aren't functioning as expected, then <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">call an engineer</a> to take a closer look.</p>
<h3>Repeated lockouts</h3>
<p>Boiler manufacturers use the term boiler lockout when a boiler has shut down. When a boiler has a fault, the 'lockout' function shuts the system down to prevent further damage.&nbsp;</p>
<p>Depending on what kind of boiler you own, the interface may have a flashing light or an error code.</p>
<p>Combi boiler lockouts are usually because of one of the following reasons:</p>
<ul>
<li>Fan issues</li>
<li>Pump failure</li>
<li>Power cut</li>
<li>An ignition problem</li>
<li>A system blockage</li>
</ul>
<p>To fix a combi boiler lockout, you can try resetting the system and see if anything changes. Beyond this, frequent lockouts are a sign that your system needs to be examined, <a href="https://www.boxt.co.uk/home-cover" rel="follow">serviced</a> or repaired by a qualified boiler engineer.</p>
<h2>Explore your heating options with BOXT</h2>
<p>While an issue with your boiler might seem like the end of the world, many can be solved by a Gas Safe registered engineer in a single visit.</p>
<p>Here at BOXT, we strive to provide prompt, high-quality services nationwide. If you ever think your boiler needs fixing, contact our team, and we can arrange a callout.</p>
<p>If your combi boiler is over 15 years old, it might be time for a more energy-efficient replacement. Tell us a few details about your home and its heating needs, and we&rsquo;ll recommend top-performing <a href="https://www.boxt.co.uk/boilers" rel="follow">boiler</a> models at fair, fixed prices.</p>

Learn

Common combi boiler problems and how to fix them

Looking to learn more about your boiler? Take a look at our comprehensive guide on how to reset a boiler. Featuring Baxi, Vaillant, Ideal and Worcester Bosch.

<p>The wonderful world of <a href="https://www.boxt.co.uk/boilers" rel="follow">boilers</a>. These domestic workhorses are the household's unsung heroes, especially during the winter months.</p>
<p>When it comes to your heating system, it pays to know your way around it. This way, if any issues arise, you'll have a better idea of how to tackle them and get your home running as it should once again.</p>
<p>A handy tip in boiler maintenance is knowing how to reset your boiler. Below, we'll go through some of the most common models on the market today and how to reset them when the need presents itself.</p>
<h2>Safety precautions</h2>
<p>Resetting a boiler using the controls is not classed as working on the boiler, so homeowners can safely do this. Any more in-depth work must be performed by a qualified, Gas Safe registered engineer. If a problem persists after resetting the boiler, you should <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">contact a Gas Safe engineer</a>, as there might be an underlying issue that resetting alone won&rsquo;t resolve.</p>
<h2>Signs your boiler might need to be reset</h2>
<p>It&rsquo;s important only to reset your boiler when something is actually wrong, which means it&rsquo;s important to be able to recognise the telltale signs of an internal issue somewhere in the system.</p>
<p>Here are some of the most common symptoms to look out for as a signal to reset your boiler.</p>
<ul>
<li><strong>No heating or hot water</strong>: If your boiler isn't performing as it should, it may benefit from a reset.</li>
<li><strong>Error codes</strong>: Fault or error codes are a great way to identify an issue with your boiler. If you check your boiler's manufacturer's notes, it may suggest resetting the boiler to tackle an error code.</li>
<li><strong>Thermostat malfunction</strong>: The boiler thermostat can sometimes stop working in sync with the system. Resetting the boiler can help get things working as they should.</li>
<li><strong>A power cut</strong>: If your home has suffered a power outage, there's a good chance your boiler will need to be reset, as it could have forced a boiler lockout.</li>
</ul>
<p>Whilst these symptoms can often be remedied with a simple reset, it is crucial that you do not carry out any work on your boiler. <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Get in touch with a Gas Safe registered engineer</a> if any issues with your boiler persist so they can investigate further and resolve any issues you still have.&nbsp;</p>
<h2>How to reset a Baxi boiler</h2>
<p>Baxi boilers tend to be able to be reset in three different ways, depending on their design. These are as follows.<br>Resetting a Baxi boiler with a reset button<br>In this scenario, press the reset button and hold until you can hear the boiler resetting.</p>
<h3>Resetting a Baxi boiler with a thermostat control knob</h3>
<p>Turn the thermostat control knob anticlockwise. Hold until the red lockout light turns off, and then turn back to your desired setting.</p>
<h3>Resetting a Baxi boiler with an ON/OFF/SELECTOR switch</h3>
<p>Here, you must open the pull down panel to show the full control panel.</p>
<p>To reset the boiler, you need to turn the selector switch to the R (Reset) position, hold for at least 5 seconds, and release.</p>
<p>Visit the manufacturer&rsquo;s website for more information on <a href="https://www.baxi.co.uk/faqs/how-to-reset-a-baxi-boiler" rel="follow noopener" target="_blank">resetting Baxi boilers</a>.</p>
<h3>How to reset an Ideal boiler</h3>
<p>With Ideal boilers, most of the reset buttons can be found beneath the display screen. For boilers with a digital display, you will likely find the reset option in the "settings" section of the menu. You can find exactly where the reset button is if you take a look at the manufacturers' notes.</p>
<p>Below are some of the top models from Ideal's range and how to reset them.</p>
<h3>Resetting Ideal Espirit Eco 2 boilers</h3>
<p>To reset this boiler, press the select and arrow up button for 2 seconds at the same time.</p>
<h3>Resetting Ideal Logic boilers</h3>
<p>Press the reset button on the front of the boiler. It will then repeat its ignition sequence.</p>
<h3>Resetting Ideal Logic + boilers</h3>
<p>The reset button is below the digital display. Press it once.</p>
<h3>Resetting Ideal Vogue Max boilers</h3>
<p>Press the reset button underneath the digital display.</p>
<p>Read our blog on <a href="https://www.boxt.co.uk/boilers/guides/how-to-restart-or-reset-ideal-boilers" rel="follow">resetting your Ideal boiler</a> or visit <a href="https://idealheating.com/user-guides" rel="follow noopener" target="_blank">Ideal&rsquo;s website</a> for more information.</p>
<h2>How to reset a Navien boiler</h2>
<p>With <a href="https://www.boxt.co.uk/boilers/navien-boilers" rel="follow">Navien boilers</a>, the reset button is often located on the front panel, near the control display screen. Below are some of the top models in their range and specifics on how to reset them.</p>
<h3>Resetting Navien NCB300 boilers</h3>
<p>Resetting this boiler is as simple as pressing the power button. Failing this, consult the manufacturer's notes.</p>
<h3>Resetting Navien LCB700, NCB700, &amp; NCB500 boilers</h3>
<p>Press the back button to reset the LCB700, NCB500 and NCB700 boilers. If the boiler does not restart, look at the manufacturer's notes.</p>
<h3>Resetting Navien NCB-24LDWE boilers</h3>
<p>To reset this model, press the reset button on the boiler's front panel.</p>
<p>We have a dedicated blog for <a href="https://www.boxt.co.uk/boilers/guides/navien-boiler-reset" rel="follow">resetting Navien boilers</a>, so be sure to read on for more information on the topic. To learn more about resetting other Navien models, you can check <a href="https://navien.co.uk/support/manuals-and-brochures/" rel="follow noopener" target="_blank">Navien&rsquo;s boiler page</a> directly.</p>
<h2>How to reset a Vaillant boiler</h2>
<p>The boiler reset button on most Vaillant models is located on the boiler's display and will show an icon of a flame with a line crossed through it.</p>
<p>To reset a Vaillant boiler, you need to hold this button down for three seconds. You will know it has worked as the display screen will change, and you will hear the boiler reset.</p>
<p>While this is the case for most Vaillant boilers, it always makes sense to check your user manual or the <a href="https://www.vaillant.co.uk/advice/understanding-heating-technology/boilers/how-to-reset-a-boiler/" rel="follow noopener" target="_blank">Vaillant website</a> if you are unsure.</p>
<h2>How to reset a Worcester Bosch boiler</h2>
<p>If your Worcester Bosch boiler has stopped working properly or the blue light on the front of the system is flashing, it may be worth trying a reset.</p>
<p>There are some subtle variations in methods from model to model, so we'll outline the steps for the most common Worcester Bosch boilers below.</p>
<h3>Resetting Worcester 4000 boilers</h3>
<p>On the digital display, scroll using the up and down keys until you see the word "reset". Press that, and the boiler should restart at its current temperature.</p>
<h3>Resetting Worcester Greenstar Si, i &amp; CDi Compact Boilers</h3>
<p>Press the reset button. A tick should briefly appear.</p>
<h3>Resetting Worcester Greenstar CDi Boilers</h3>
<p>Hold the reset button for three seconds.</p>
<p>The blue light flashing will stop at the reset button and fault indicator. If the reset is successful, the boiler will start again. If not, an alert code will display, in which case you should get in touch with a qualified engineer.</p>
<h3>Resetting Worcester Greenstar Ri boilers</h3>
<p>If there is a fault, the blue mains light will flash.</p>
<p>To reset, turn the central heating temperature knob clockwise until it reaches the &ldquo;RESET&rdquo; position. Hold the button down for 5 seconds and then return to the original temperature setting.</p>
<p>The boiler should reset.</p>
<p>If the boiler you&rsquo;re looking for isn&rsquo;t on this page, take a look at <a href="https://www.worcester-bosch.co.uk/support/manuals-and-brochures" rel="follow noopener" target="_blank">Worcester Bosch&rsquo;s manual and brochures</a> page for further information.</p>
<h2>Replace your boiler with an A-rated model from BOXT</h2>
<p>If you&rsquo;re having to reset your boiler regularly, you could be due a <a href="https://www.boxt.co.uk/boilers/boiler-replacement" rel="follow">new boiler</a>. Find the perfect upgrade for your home with BOXT. We supply a range of A-rated boilers that deliver on efficiency, usability, and price.</p>
<p>Rather not pay it all at once? We understand. Take a look at our <a href="https://www.boxt.co.uk/boilers/subscription" rel="follow">boiler subscription</a> offering, where you can heat your home with a brand-new system for as little as &pound;30 a month.</p>
<p>If you aren&rsquo;t sure where to start, <a href="https://www.boxt.co.uk/contact-us" rel="follow">get in touch</a> with one of our team to find out how we can help your home reach optimal performance.</p>

Find a new, A-rated boiler for your home in just 90 seconds with us

How to reset a boiler

Explore how to prepare your home for a boiler replacement in this BOXT guide, including four key things you should do before the engineer arrives.

<p>Installing a <a href="https://www.boxt.co.uk/boilers/boiler-replacement" rel="follow">new boiler</a> in your home can sometimes be a long and disruptive process, especially if it&rsquo;s being installed in a different location than your old boiler.</p>
<p>But, to minimise installation times and maximise efficiency, there are things you can do to help the Gas Safe registered engineer who'll be carrying out the work.</p>
<p>In this guide, we explore four tips to help you prepare for your <a href="https://www.boxt.co.uk/boilers/boiler-replacement" rel="follow">boiler replacement</a> and ensure the installation process is as smooth and straightforward as possible. But first, let's explore why preparing your home for its new heating system is a good idea.</p>
<h2>How to prepare for boiler installation</h2>
<p>Before the Gas Safe engineer fits your new boiler, complete the following tasks to ensure the <a href="https://www.boxt.co.uk/boilers/boiler-installation" rel="follow">boiler installation</a> process goes as smoothly as possible.</p>
<h3>1. Clear the area and a pathway to your boiler</h3>
<p>Whether you&rsquo;re having your new boiler installed in the same place as your old one or opting to have it moved to a new location, you need to make sure the area around your boiler is clear. You should also ensure the existing system, radiators, water stop tap, and gas meter are accessible and that the new boiler location is clean, too, if it&rsquo;s being relocated. Additionally, if the new boiler is to be installed in the loft, the floor in the loft would need to be boarded and also has a fixed light and a fixed loft ladder.</p>
<p>Once you've cleaned around where the boiler will be installed, you must ensure a pathway from there to the front or back door. The engineer will likely be nipping in and out to their van to fetch various tools, not to mention carrying the new boiler into your home. Guaranteeing ease of access reduces installation time and makes the process much easier and safer.</p>
<h3>2. Identify any areas of concern</h3>
<p>Before installing the boiler, you should identify additional concerns in your heating system. This could include rusty pipework, problematic radiators or inconsistent pressure levels. Basically, anything you'd like the engineer to look at, make them aware of it before they get to work installing your <a href="https://www.boxt.co.uk/boilers/boiler-replacement" rel="follow">replacement boiler</a>.</p>
<p>Flagging any issues will mean the engineer can advise or could even fix them while they install your boiler or organise a time to come back and resolve the issue.</p>

Find out more about common boiler problems and how to identify them.

Common boiler problems

<h3>3. Keep little ones out of the way</h3>
<p>As well as clearing space for your boiler to be installed, you need to make sure children and pets are kept out of the way. This is more of a health and safety concern as opposed to something that will increase productivity, but it may help the engineer concentrate on their work.</p>
<p>Pets, in particular, can be a hazard, so it's important you keep them away from the work area and ensure the engineer has enough space to work.</p>
<h3>4. Identify your home&rsquo;s fuse box or consumer unit</h3>
<p>Whether you&rsquo;re getting a system, standard or combi boiler installed, every boiler needs to be connected to your home&rsquo;s electricity supply. Contrary to popular belief, even gas and oil boilers rely on electricity to ignite, so you&rsquo;ll need to locate the boiler's electrical isolation point (fused spur) and potentially your property&rsquo;s fuse box before your engineer arrives.&nbsp;</p>
<p>If possible, make it easy for your engineer to access the boiler&rsquo;s fused spur or fuse box by clearing a safe pathway to the switch or fuse box then show them the specific switch that controls your boiler. Making sure the engineer only flips the necessary fuse will prevent other areas and appliances in your home from ending up without power.</p>

Learn how and why gas boilers need electricity to heat our homes in our expert's guide.

Do gas boilers use electricity?

<h2>What is the new boiler installation process?</h2>
<p>Once you've cleared the area where the boiler will be installed, found the fuse and any areas for concern, and got your pets or kids out of harm's way, the installation can begin. But what happens when the engineer arrives at your home with a new boiler? Here's what happens in seven simple steps:</p>
<p><strong>1. The boiler and/or system electricity supply needs switching off</strong>: Isolating the electrics before the installation ensures safe working, and the electricity supply may require turning off at different times during the installation to install new controls or even a new fused spur.</p>
<p><strong>2. The gas will need isolating and testing for leaks before the installation</strong>: Testing for gas leaks before installation is important to identify any unsafe situations with the supply and, where practical, resolve and/or repair.</p>
<p><strong>3. The system is drained and the old boiler removed</strong>: The existing system will be firstly drained of all water, and the old boiler will then be removed. Removing smaller appliances, like combi boilers, can be relatively straightforward, but larger heating systems, e.g. those with water storage tanks/cylinders, will take longer.</p>
<p><strong>4. The area is checked and prepared</strong>: During this process, the engineer will assess the boiler's flue system to ensure it complies with the manufacturer's instructions and building regulations or what needs to be done to ensure the new flue complies.</p>
<p><strong>5. The heating system is flushed and cleaned</strong>: Following British standards,&nbsp;engineers should&nbsp;<a href="https://www.boxt.co.uk/boilers/guides/power-flush" rel="follow">flush</a> your central heating system each time a new boiler is installed.</p>
<p><strong>6. The pipework is upgraded</strong>: If you want your boiler to be moved or the pipework looks worse for wear, the engineer will upgrade some or all of the pipes, including the gas pipework, where necessary.</p>
<p><strong>7. The new boiler is installed, and accessories are fitted</strong>: Straightforward installations can be completed within a day, but more complicated work can be significantly longer. Once the boiler is installed, the engineer can work on fitting accessories, like <a href="https://www.boxt.co.uk/boilers/guides/magnetic-boiler-filters" rel="follow">system filters</a>, condensate pumps and additional required flue lengths.</p>
<p><strong>8. Checks are carried out</strong>: The boiler will be tested to ensure it works properly and should be commissioned in accordance with the manufacturer's instructions.</p>
<p><strong>9. The boiler is registered</strong>: Once installed, the engineer will register your new boiler with Gas Safe, the relevant local authorities, and the boiler manufacturer to validate the appliance's warranty. At BOXT, we do this for you!</p>
<p>Check out our blog for a more detailed look at <a href="https://www.boxt.co.uk/boilers/guides/what-happens-when-a-new-boiler-is-fitted" rel="follow">what happens when a new boiler is fitted</a>, including whether your water and gas supply will need to be turned off.</p>
<h3>What is the average installation time for a new boiler?</h3>
<p>The time it takes to install a boiler depends on the size and scale of the installation, but it's typically between one and two days. Explore the factors that can prolong the process in our '<a href="https://www.boxt.co.uk/boilers/guides/how-long-does-it-take-to-fit-a-new-boiler" rel="follow">How long does it take to fit a new boiler?</a>' guide.</p>
<h3>Is it better to repair your current boiler or replace it?</h3>
<p>Deciding whether to replace or repair your boiler is a tricky decision; on the one hand, the short-term cost of <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">repairing your boiler</a> may be cheaper than a new model; on the other hand, a new appliance offers long-term peace of mind.</p>
<p>To help you make an informed decision, we explore the pros and cons of each side in our '<a href="https://www.boxt.co.uk/boilers/guides/boiler-repair" rel="follow">New boiler vs boiler repair</a>' blog.</p>
<h2><strong>Get your next boiler from BOXT</strong></h2>
<p>Still on the search for your next appliance? Take a look at <a href="https://www.boxt.co.uk/boilers/guides/how-to-choose-your-perfect-boiler">how to choose your perfect boiler</a> for tips on making the right purchase.</p>
<p>Ready to get your new boiler? With BOXT, you could have a new appliance installed as early as tomorrow. Use our <a href="https://www.boxt.co.uk/find-a-boiler/">Find a Boiler</a> tool to get started and look forward to a more affordable, more comfortable home.</p>

Get fixed-price quotes for A-rated replacement boilers from BOXT

How to prepare your home for a boiler replacement

Find full lists of Ideal boiler error and fault codes alongside possible causes and solutions. Keep your Ideal boiler running smoothly with help from BOXT.

<p>Noticing that there&rsquo;s a fault with your Ideal <a href="https://www.boxt.co.uk/boilers" rel="follow">boiler</a> is less than ideal, but getting it sorted doesn&rsquo;t have to be as much of a hassle as you&rsquo;d expect.</p>
<p>It&rsquo;s important to note that once you&rsquo;ve discovered an issue with your system, a Gas Safe registered engineer needs to be called to diagnose and rectify the problem fully.</p>
<p>To make the process of diagnosing any problems as painless as possible, Ideal pre-programs its boilers with fault and error codes. These codes are displayed on the user interface to alert you and your engineer to anything that needs attention within the system.</p>
<p>Here, we&rsquo;ll cover all of the most common Ideal boiler fault codes, discussing their meaning and advising on any next steps that you or a Gas Safe registered engineer can take to get things back to working as they should.</p>
<h2>Ideal boiler fault &amp; error codes by boiler model</h2>
<ul>
<li><a href="#h_283069789193621705408930675" rel="follow">Ideal boiler F fault codes</a></li>
<li><a href="#h_373458347195981705408940506" rel="follow">Ideal boiler L fault codes</a></li>
<li><a href="#h_651947860197021705408948577" rel="follow">Ideal boiler C fault codes</a></li>
<li><a href="#h_541516278198321705408957447" rel="follow">Additional Ideal boiler fault codes</a></li>
</ul>
<h2 id="h_283069789193621705408930675">Ideal boiler F fault codes</h2>
<table border="1" style="border-collapse: collapse; width: 100.054%; height: 293.907px;"><colgroup><col style="width: 16.4882%;"><col style="width: 40.1695%;"><col style="width: 43.3423%;"></colgroup>
<tbody>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;"><strong>Error code</strong></td>
<td style="height: 19.5938px;"><strong>Problem</strong></td>
<td style="height: 19.5938px;"><strong>Solution</strong></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">F</td>
<td style="height: 19.5938px;">Boiler operating in frost mode.</td>
<td style="height: 19.5938px;"><a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact an engineer.</a></td>
</tr>
<tr style="height: 39.1875px;">
<td style="height: 39.1875px;">FD</td>
<td style="height: 39.1875px;">No water flow</td>
<td style="height: 39.1875px;">Repressurise the boiler. If this doesn&rsquo;t resolve the issue, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">call an engineer</a>.</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">FU</td>
<td style="height: 19.5938px;">Flow/return differential &ndash; 50&deg;C</td>
<td style="height: 19.5938px;"><a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact an engineer.</a></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">F1</td>
<td style="height: 19.5938px;">Low boiler pressure</td>
<td style="height: 19.5938px;">Top up the <a href="https://www.boxt.co.uk/boilers/guides/boiler-pressure" rel="follow">water pressure</a>.</td>
</tr>
<tr style="height: 39.1875px;">
<td style="height: 39.1875px;">F2/FL</td>
<td style="height: 39.1875px;">Flame loss</td>
<td style="height: 39.1875px;">Reset the boiler. If this doesn&rsquo;t resolve the issue, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">call a Gas Safe engineer</a>.</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">F3</td>
<td style="height: 19.5938px;">Fan fault</td>
<td style="height: 19.5938px;"><a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact an engineer.</a></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">F4</td>
<td style="height: 19.5938px;">Thermistor fault</td>
<td style="height: 19.5938px;"><a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact an engineer.</a></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">F5</td>
<td style="height: 19.5938px;">Return thermistor fault</td>
<td style="height: 19.5938px;"><a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact an engineer.</a></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">F6</td>
<td style="height: 19.5938px;">Outside sensor fault</td>
<td style="height: 19.5938px;"><a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact an engineer.</a></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">F7</td>
<td style="height: 19.5938px;">Low mains voltage</td>
<td style="height: 19.5938px;"><a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact an engineer.</a></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">F8</td>
<td style="height: 19.5938px;">Printed circuit board (PCB) fault</td>
<td style="height: 19.5938px;"><a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact an engineer.</a></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">F9</td>
<td style="height: 19.5938px;">Unconfigured PCB.</td>
<td style="height: 19.5938px;"><a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact an engineer.</a></td>
</tr>
</tbody>
</table>
<h2 id="h_373458347195981705408940506">Ideal boiler L fault codes</h2>
<table border="1" style="border-collapse: collapse; width: 100.054%; height: 431.063px;"><colgroup><col style="width: 16.8094%;"><col style="width: 40.0532%;"><col style="width: 43.0303%;"></colgroup>
<tbody>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;"><strong>Error code</strong></td>
<td style="height: 19.5938px;"><strong>Problem</strong></td>
<td style="height: 19.5938px;"><strong>Solution</strong></td>
</tr>
<tr style="height: 39.1875px;">
<td style="height: 39.1875px;">L1</td>
<td style="height: 39.1875px;">Low water flow</td>
<td style="height: 39.1875px;">Reset the boiler. If this doesn&rsquo;t resolve the issue, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">call an engineer</a>.</td>
</tr>
<tr style="height: 39.1875px;">
<td style="height: 39.1875px;">L2</td>
<td style="height: 39.1875px;">Ignition lockout</td>
<td style="height: 39.1875px;">Reset the boiler. If you hear a <a href="https://www.boxt.co.uk/boilers/guides/9-reasons-why-your-boiler-is-making-a-noise" rel="follow">rumbling noise</a>, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">call an engineer</a>.</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">L3</td>
<td style="height: 19.5938px;">No flow thermistor fault</td>
<td style="height: 19.5938px;"><a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact an engineer.</a></td>
</tr>
<tr style="height: 39.1875px;">
<td style="height: 39.1875px;">L9/H9/HA/LA</td>
<td style="height: 39.1875px;">Overheating</td>
<td style="height: 39.1875px;">Check pressure readings and <a href="https://www.boxt.co.uk/boilers/guides/how-to-bleed-a-radiator" rel="follow">bleed your radiators</a>. If no change, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">call an engineer</a>.</td>
</tr>
<tr style="height: 39.1875px;">
<td style="height: 39.1875px;">LF</td>
<td style="height: 39.1875px;">Ignition fault</td>
<td style="height: 39.1875px;">Reset your boiler. If your boiler is rumbling, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">contact a qualified engineer</a>.</td>
</tr>
<tr style="height: 39.1875px;">
<td style="height: 39.1875px;">L4</td>
<td style="height: 39.1875px;">Flow thermistor fault</td>
<td style="height: 39.1875px;">Restart the boiler. If the issue continues, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">contact an engineer</a>.</td>
</tr>
<tr style="height: 39.1875px;">
<td style="height: 39.1875px;">L5</td>
<td style="height: 39.1875px;">Boiler return pipe issue</td>
<td style="height: 39.1875px;">Turn off the boiler&rsquo;s power at the fuse spur, then turn it back on. If the issue persists, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">call an engineer</a>.</td>
</tr>
<tr style="height: 39.1875px;">
<td style="height: 39.1875px;">L6</td>
<td style="height: 39.1875px;">Flame detection fault</td>
<td style="height: 39.1875px;">Reset your boiler. If the problem persists, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">contact an engineer</a>.</td>
</tr>
<tr style="height: 58.7812px;">
<td style="height: 58.7812px;">LC</td>
<td style="height: 58.7812px;">5 boiler resets in 15 minutes.</td>
<td style="height: 58.7812px;">Turn the electrical supply to the boiler off and on. If the boiler fails to operate, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">contact a Gas Safe registered engineer</a>.</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">L9</td>
<td style="height: 19.5938px;">Unconfigured PCB</td>
<td style="height: 19.5938px;"><a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact an engineer.</a></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">L-F</td>
<td style="height: 19.5938px;">Boiler fails to ignite</td>
<td style="height: 19.5938px;">Try resetting the boiler. If nothing changes, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">contact an engineer</a>.</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">L-A</td>
<td style="height: 19.5938px;">Boiler overheated</td>
<td style="height: 19.5938px;">Check that there is <a href="https://www.boxt.co.uk/boilers/guides/boiler-pressure" rel="follow">sufficient water pressure</a> in the central heating system and that all radiators have been bled. Then, reset the boiler. If the issue persists, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">contact an engineer</a>.</td>
</tr>
</tbody>
</table>
<h2 id="h_651947860197021705408948577">Ideal boiler C fault codes</h2>
<table border="1" style="border-collapse: collapse; width: 100.054%; height: 117.563px;"><colgroup><col style="width: 17.1306%;"><col style="width: 40.1599%;"><col style="width: 42.6025%;"></colgroup>
<tbody>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;"><strong>Error code</strong></td>
<td style="height: 19.5938px;"><strong>Problem</strong></td>
<td style="height: 19.5938px;"><strong>Solution</strong></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">C2</td>
<td style="height: 19.5938px;">Boiler chip card fault.</td>
<td style="height: 19.5938px;">Reset your boiler. If the issue persists, <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">contact an engineer</a>.</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">C0</td>
<td style="height: 19.5938px;">Central heating signal issue.</td>
<td style="height: 19.5938px;"><a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Contact an engineer.</a></td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">C</td>
<td style="height: 19.5938px;">The boiler is operating in central heating mode. Or the boiler has a call for central heating, and the appliance has reached the desired set temperature.</td>
<td style="height: 19.5938px;">No solution needed. This is a setting, not a problem.</td>
</tr>
</tbody>
</table>
<h2 id="h_541516278198321705408957447">Additional Ideal boiler fault codes</h2>
<table border="1" style="border-collapse: collapse; width: 100.054%; height: 156.75px;"><colgroup><col style="width: 17.0236%;"><col style="width: 40.3739%;"><col style="width: 42.4955%;"></colgroup>
<tbody>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;"><strong>Error code</strong></td>
<td style="height: 19.5938px;"><strong>Problem</strong></td>
<td style="height: 19.5938px;"><strong>Solution</strong></td>
</tr>
<tr style="height: 58.7812px;">
<td style="height: 58.7812px;">D</td>
<td style="height: 58.7812px;">The boiler is operating in hot water mode, or the boiler has a call for hot water and the appliance has reached the desired set temperature.</td>
<td style="height: 58.7812px;">No solution needed; this is a setting.</td>
</tr>
<tr style="height: 39.1875px;">
<td style="height: 39.1875px;">0</td>
<td style="height: 39.1875px;">The boiler is in standby mode awaiting hot water requests or a central heating call.</td>
<td style="height: 39.1875px;">Choose your settings.</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">H-3</td>
<td style="height: 19.5938px;">Domestic hot water thermistor error.</td>
<td style="height: 19.5938px;">Reset the system.</td>
</tr>
<tr style="height: 19.5938px;">
<td style="height: 19.5938px;">No display</td>
<td style="height: 19.5938px;">No heating or hot water.</td>
<td style="height: 19.5938px;">This is a PCB error. <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Call an engineer</a>.</td>
</tr>
</tbody>
</table>
<h2>Protect your home&rsquo;s central heating with BOXT</h2>
<p>Luckily, the majority of Ideal <a href="https://www.boxt.co.uk/boilers" rel="follow">boiler</a> problems are relatively quick and easy for qualified engineers to fix, provided they&rsquo;re identified promptly. If you suspect that any of the issues mentioned above are to blame for your boiler&rsquo;s malfunctioning, and the recommended fix isn&rsquo;t as simple as pressing the reset button, always contact a Gas Safe registered engineer who&rsquo;ll be able to come and assist you.</p>
<p>Sometimes, it&rsquo;s better to be safe than sorry. We all know that household issues arise when you&rsquo;re least prepared for them, so it helps to have a good idea of how your boiler is performing.&nbsp;</p>
<p>If you&rsquo;re unsure about the current performance of your boiler, why not book a <a href="https://www.boxt.co.uk/boilers/boiler-servicing" rel="follow">boiler service</a>? With the help of our engineers, you&rsquo;ll be sound in the knowledge that your boiler is doing the most it can possibly do for your home.</p>

Ideal boiler fault & error codes

Find full lists of Vaillant boiler error and fault codes with possible causes and fixes. Resolve issues with combi, system and standard boilers.

Vaillant boiler fault & error codes

BOXT engineer arriving at the front door with his tool box

Facing Navien boiler problems? Explore these common issues, their causes, and what to do when you encounter them.

<p>Even though it&rsquo;s a relative newcomer to the UK <a href="https://www.boxt.co.uk/boilers" rel="follow">boiler</a> market, <a href="https://www.boxt.co.uk/boilers/navien-boilers" rel="follow">Navien</a> is one of the most trusted manufacturers there is. Across the Far East, consumers see Navien as the go-to brand for domestic home heating solutions, celebrating their industry-leading technologies, incredible energy efficiency and user-friendly features.</p>
<p>But no technology is perfect, and even the most reliable models can encounter issues from time to time. If you happen to experience a problem with your Navien boiler, getting it fixed promptly will be a top priority for everyone living in your property. Luckily, most issues can be rectified by a qualified professional pretty easily.</p>
<p>In this guide, we&rsquo;ll walk you through some of the common problems you may encounter with a Navien boiler. We&rsquo;ve split this into issues that you should be able to remedy yourself and urgent problems that should only be attempted by a Gas Safe registered engineer (such as the team at BOXT).&nbsp;</p>
<h2>Common Navien boiler problems and fixes</h2>
<p>When there's a problem with your boiler, you'll usually notice an error code or an issue with your pressure gauge being too high or too low.&nbsp;<br>Here are some of the most common Navien boiler problems and the steps you can take to fix them.</p>
<p><strong>Please note: </strong>While these fixes can be performed yourself; if you don&rsquo;t feel confident, don&rsquo;t hesitate to enlist the help of a professional.&nbsp;</p>
<h3>Ignition failure</h3>
<p>One of the most common error codes for Navien boilers is E003, which indicates there's an ignition fault.</p>
<p>If you encounter this error code, try restarting your boiler and checking the gas supply. If you've already tried those things and your boiler still fails to ignite, you should contact a Gas Safe registered engineer to determine the exact problem.</p>
<p>They'll likely need to access and inspect the boiler's controls to find the cause, whether it's debris or faulty parts.</p>
<h3>Low pressure</h3>
<p>If your pressure gauge is showing <a href="https://www.boxt.co.uk/boilers/guides/why-does-my-boiler-pressure-keep-dropping" rel="follow">little to no pressure in your boiler</a>, it likely means the water pressure in your boiler is too low for the system to work efficiently. You might also see the error code E302.</p>
<p>Low pressure can be down to numerous things, including a potential fault with the pressure relief valve or a leak within the boiler or on the system pipework.</p>
<p>If you aren't confident in attempting to raise your boiler's pressure yourself, please contact one of our expert Gas Safe registered engineers to help you.</p>
<h3>High pressure</h3>
<p>If your <a href="https://www.boxt.co.uk/boilers/guides/is-your-boiler-pressure-too-high-heres-what-to-do" rel="follow">boiler's pressure gauge is too high</a>, contact a Gas Safe registered engineer who will be able to give you expert advice.<br>For more information, see our <a href="https://www.boxt.co.uk/boilers/guides/boiler-pressure" rel="follow">complete guide to boiler pressure</a>.</p>
<p><img src="https://cdn.buttercms.com/kLpNELX3Qfy2A79LZQWJ" alt="BoilerInstall-carousel08.webp"></p>
<h2>Urgent Navien boiler problems and fixes</h2>
<p>Below are some of the most common urgent boiler problems and their potential causes. If you encounter one of these issues with your boiler, it is essential to seek an emergency boiler call out from a Gas Safe registered engineer.&nbsp;</p>
<p><strong>Important: </strong>Do <strong>NOT</strong> attempt these fixes yourself.&nbsp;</p>
<h3>Overheating heat exchanger</h3>
<p>An overheating heat exchanger (error code E016 or E046) occurs when the component responsible for transferring heat from the burner to the water becomes excessively hot.</p>
<p>This can be caused by issues such as a lack of water flow or blocked pipes. An overheating heat exchanger can lead to serious safety hazards, including potential damage to the boiler and a risk of carbon monoxide leakage, which is also <a href="https://www.boxt.co.uk/boilers/guides/carbon-monoxide-testing" rel="follow">why it&rsquo;s important to have a working carbon monoxide alarm</a>.</p>
<p>If you suspect this problem, it is crucial to <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">contact a Gas Safe registered engineer</a> to diagnose and address the issue, ensuring both your safety and the efficiency of your boiler.</p>
<h3>Flue issue</h3>
<p>The <a href="https://www.boxt.co.uk/boilers/guides/what-is-a-boiler-flue" rel="follow">boiler flue</a> is a component that connects to your Navien boiler and safely transports the combustion gases to outside&nbsp;<br>Factors like corrosion or obstructions in the flue/exhaust pipe can cause issues, potentially leading to harmful carbon monoxide leaks within your home.</p>
<p>If you encounter any flue related problems or suspect a malfunction, or blocked condensate, it's critical to <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">contact a Gas Safe registered engineer</a> without delay.</p>
<h3>Temperature sensor issue</h3>
<p>The temperature sensors (thermistors) in your Navien boiler are responsible for monitoring and regulating the water's temperature within the appliance.</p>
<p>Issues can include general wear and tear, electrical problems, or sensor misplacement, causing the sensor to give inaccurate readings.</p>
<p>You shouldn't try to fix any underlying issue yourself. <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">Call a Gas Safe registered engineer</a>, who will replace the sensor or find the cause of the inaccurate readings for you.</p>

<h2>Choose BOXT Home Cover</h2>
<p>We know how stressful it can be when your boiler stops working. That's why, at BOXT, we offer <a href="https://www.boxt.co.uk/home-cover" rel="follow">home cover plans</a> with no call-out or excess charges as standard.</p>
<p>Our Gas Safe registered engineers are experienced in installing and maintaining <a href="https://www.boxt.co.uk/boilers/navien-boilers" rel="follow">Navien boilers</a> too, so you, and your heating, will be in safe hands.</p>
<p>For more boiler advice, whether that&rsquo;s information on <a href="https://www.boxt.co.uk/boilers/guides/what-happens-when-a-new-boiler-is-fitted" rel="follow">what happens when a new boiler is fitted</a>, <a href="https://www.boxt.co.uk/boilers/guides/clearing-an-airlock-from-your-central-heating-system" rel="follow">how to clear an airlock</a>, and <a href="https://www.boxt.co.uk/boilers/guides/full-boiler-protection-plans" rel="follow">everything you need to know about full boiler protection plans</a>, check out our <a href="https://www.boxt.co.uk/guides?category=boilers" rel="follow">dedicated boiler guides</a>.</p>
<p>If you're just after some guidance, you can message us on our&nbsp;<a href="https://www.boxt.co.uk/" rel="follow">Live Chat</a> where you get the best advice from our heating specialists.</p>

How to troubleshoot Navien boiler problems

Back boilers reached their height of popularity during the 70s and 80s and are still fuelling many of the UK's central heating systems. Sitting right behind your fireplace, a boiler that fits perfectly, tucked away without the need for any extra space in the house.

<p>Back boilers reached their height of popularity during the 70s and 80s and are still fuelling many of the UK's central heating systems. Sitting right behind your fireplace, a <a href="https://www.boxt.co.uk/boilers" rel="follow">boiler</a> that fits perfectly, tucked away without the need for any extra space in the house.</p>
<p><strong>The UK government made installing new back boilers illegal in 2005</strong> when building regulations made it a requirement to install only high-efficiency condensing boilers. Although many have now been replaced by wall-hung condensing boilers, there are still a large number of back boilers in use across the UK.</p>
<p>The following article will provide you with all you need to know about back boilers, how much a back boiler replacement costs, and what alternatives are out there that won&rsquo;t break the bank.</p>
<h2>What are back boilers?</h2>
<p>Back boilers came into fashion around the 1960s as an easy and out-of-sight option behind a fireplace, chimney or stove, as a way of providing heat and hot water to homes across the UK.&nbsp;</p>
<h2>How do back boilers work?</h2>
<p>Back boilers were built to save space for a heat source, and they are designed to fit in the fire opening behind a fireplace and use the same chimney to disperse the gases.</p>
<p>The back boiler features a cold water inlet source located at the bottom. The heat exchanger then heats this cold water and sends it to the output using an electrical pump. To make sure pressure doesn&rsquo;t build up, hot water is kept in a hot water cylinder that features an overflow vent.&nbsp;</p>
<h2>Why is it illegal to install a back boiler?</h2>
<p>As <a href="https://www.boxt.co.uk/boilers/combi-boilers">combi boilers</a> and gas or oil boilers took over the market after the 1980s, the parts for repairing or replacing a back boiler became less and less available.<span style="font-size: 11pt; font-family: Arial; color: rgb(0, 0, 0);"></span></p>
<p>However, the main drawback is their inefficiency. While most modern <a href="https://www.boxt.co.uk/boilers">boilers</a> have the ability to provide up to 98% efficiency, all new gas boilers have a minimum performance standard of 92% (ErP). However, a back boiler can provide maximum efficiency of 80%, making them incapable of meeting today's efficiency requirements.&nbsp;<span style="font-size: 11pt; font-family: Arial; color: rgb(0, 0, 0);"></span></p>
<p>This low-efficiency rating will greatly increase the energy consumption within your home, as well as affect your carbon footprint.&nbsp;</p>
<h3>Risks associated with back boilers&nbsp;</h3>
<p>There are also some risks associated with back boilers.&nbsp;<span style="font-size: 11pt; font-family: Arial; color: rgb(0, 0, 0);"></span></p>
<p>Back boilers have a life expectancy of 20-30 years. However, as the boiler ages, the risks associated with back boilers only increase.&nbsp;<span style="font-size: 11pt; font-family: Arial; color: rgb(0, 0, 0);"></span></p>
<ul>
<li>When a back boiler is reused after being out of use for an extended period, residual water heats up and creates pressure which can be very dangerous.</li>
<li>As the fireplace is close to the boiler, the heat and gas trapped in the fireplace without the use of a flue pipe can cause the boiler to explode.</li>
<li>Poor ventilation and a lack of access to fresh air can result in toxic fumes building up in the home.</li>
</ul>
<p>Whilst these occurrences are rare, if you do observe your back boiler overheating or suspect any other problems, call a heating engineer immediately.&nbsp;</p>
<h3>Other cons associated with back boilers</h3>
<p>There are also several other problems associated with back boilers:</p>
<ul>
<li>They aren&rsquo;t able to provide instant hot water</li>
<li>The ventilation system can be a source of noise and draughts</li>
<li>Back boilers depend on chimneys which can be problematic if you want to do building work</li>
<li>Back boiler parts are limited, so replacing damaged parts is difficult</li>
<li>Back boilers constantly expand and contract, which can cause structural damage to your home</li>
</ul>
<h2>The cost of removing a back boiler</h2>
<p>If you&rsquo;ve decided to upgrade your heating system, you&rsquo;ll likely want to know how much it will cost.&nbsp;<span style="font-size: 11pt; font-family: Arial; color: rgb(0, 0, 0);"></span></p>
<p>Firstly, you&rsquo;ll have two options:<span style="font-size: 11pt; font-family: Arial; color: rgb(0, 0, 0);"></span></p>
<ul>
<li>Remove your back boiler</li>
<li>Or decommission your back boiler (disconnect from the gas)</li>
</ul>
<p>If you choose to remove your back boiler entirely, you should expect to pay around &pound;3,500 to &pound;4,500 for the whole process, including having your new boiler installed.&nbsp;<span style="font-size: 11pt; font-family: Arial; color: rgb(0, 0, 0);"></span></p>
<p>However, decommissioning your back boiler is the cheaper option (and will save your house from being turned upside down), and you can expect to pay between &pound;3,000 and &pound;4,000 for the whole process and new installation.&nbsp;</p>
<h2>Back boiler alternatives</h2>
<p>Many options are available if you&rsquo;re looking at replacing your back boiler. However, you might not know what&rsquo;s best for you and your home.&nbsp;</p>
<p>Read on to find an alternative to your back boiler:</p>
<h3>Combi boiler</h3>
<p>This might be the best option if you live in a smaller property that doesn&rsquo;t have 2 or 3 bathrooms being used simultaneously.&nbsp;</p>
<p>Probably one of the most popular systems currently available in the UK, an A-rated combi boiler heats your water and radiators from the same unit and therefore doesn't require a lot of space or extra parts.</p>
<p>Combi boilers can run on gas, oil, LPG or electricity, which makes them very versatile and one of the UK's favourites due to the following benefits:</p>
<ul>
<li>Cheapest option and very energy efficient</li>
<li>Small size</li>
<li>Hot water on demand</li>
</ul>
<p>You can expect to pay anywhere from &pound;1,500, all the way up to &pound;3,500 for a new combi boiler - including installation.&nbsp;</p>
<p>For a closer look into combi boilers, take a look at our guide - <a href="https://www.boxt.co.uk/boilers/guides/combi-boiler-pros-cons-a-simple-guide">Combi Boiler Pros &amp; Cons: A Simple Guide</a>.&nbsp;</p>
<h3>System boiler</h3>
<p>If you have a home with several bathrooms and thus a higher water consumption, you might opt for a system boiler.</p>
<p>They require a hot water cylinder to function, so they take up more space than a combi boiler. However, this means that a large amount of hot water can be stored for hours at a time.&nbsp;</p>
<p>A system boiler comes with several other benefits:</p>
<ul>
<li>Economical and efficient</li>
<li>It can be combined with solar energy</li>
<li>Easy installation</li>
<li>Quick to heat your home</li>
</ul>
<p>Prices for a system boiler can be anything from &pound;2,000 - &pound;2,500.</p>
<p>For a closer look at system boilers, take a look at our guide - <a href="https://www.boxt.co.uk/boilers/guides/what-is-a-system-boiler">What Is A System Boiler?</a></p>
<h3>Standard boiler</h3>
<p>These boilers can be a great way to produce heat and hot water at high volumes. Standard boilers are a great choice for larger homes with multiple bathrooms.&nbsp;<span style="font-size: 11pt; font-family: Arial; color: rgb(0, 0, 0);"></span></p>
<p>A standard boiler uses hot and cold water storage tanks, usually installed in your loft, to supply water to the mains.&nbsp;<span style="font-size: 11pt; font-family: Arial; color: rgb(0, 0, 0);"></span></p>
<p>Whilst standard boilers aren&rsquo;t as common as they used to be, you can still purchase these boilers at the cost of &pound;2,000 to &pound;3,000.&nbsp;<span style="font-size: 11pt; font-family: Arial; color: rgb(0, 0, 0);"></span></p>
<p>For more information, discover our guide - <a href="https://www.boxt.co.uk/boilers/guides/what-is-a-standard-boiler">What Is A Standard Boiler?</a></p>
<h3>Biomass boilers</h3>
<p>These boilers offer an alternative to gas, LPG or electricity by using pellets that can be sustainably sourced.&nbsp;<span style="font-size: 11pt; font-family: Arial; color: rgb(0, 0, 0);"></span></p>
<p>The cost of biomass boilers can vary depending on the size, make and model, but you can generally expect to pay between &pound;7,000 and &pound;15,000.&nbsp;</p>
<h2>Replace your back boiler with BOXT</h2>
<p>There are many good reasons you should replace your back boiler sooner than later:&nbsp;</p>
<ul>
<li>Save money</li>
<li>Be more energy-efficient</li>
<li>Be more environmentally friendly</li>
<li>Eliminate the risks associated with back boilers</li>
</ul>
<p>Which <a href="https://www.boxt.co.uk/boilers" rel="follow">boiler</a> replacement option you end up going for depends on your requirements. Consider factors such as water demand for your home and how vital instant hot water is to you and your family. Whether your house has one or more bathrooms plays a significant role, as well as whether you will have enough space to house a water storage tank.</p>
<p>Thanks to the plethora of options for a <a href="https://www.boxt.co.uk/boilers/boiler-replacement" rel="follow">new boiler</a> at BOXT, you have access to boilers that will be fitted precisely to your needs.&nbsp;</p>
<p>Or why not try <a href="https://www.boxt.co.uk/boilers/subscription">BOXT Life</a> - from only &pound;35 per month, you&rsquo;ll receive a brand new boiler with installation, unlimited <a href="https://www.boxt.co.uk/boilers/boiler-repair">boiler repairs</a>, replacement and servicing, and a Google Nest thermostat - all with no deposit needed.&nbsp;</p>
<p style="margin-top: 12pt; margin-bottom: 12pt;"></p>

Are back boilers now illegal?

As a landlord, you want to make sure you have the right kind of insurance for your property. In this guide, we’ll discuss what insurance you’ll need to cover your boiler. 

<p>Landlords have a number of responsibilities for their clients with their main one ensuring that their property is in good condition. It&rsquo;s important for a landlord that their clients live in a well-maintained home with no fuss.</p>
<p><a href="https://www.boxt.co.uk/boilers" rel="follow">Boiler</a> breakdowns can be expensive to repair, however Landlords must make sure that they are able to fix any issues on their property, including any boiler problems.&nbsp;</p>
<h2>What is landlord insurance?</h2>
<p>Landlord insurance helps protect the landlord and their property from damage. This could be fire and water related damage, theft and vandalism, or even unpaid rent in some cases.</p>
<p>If gas appliances supplied by the Landlord break down then landlords are legally responsible for the repairs according to the Landlord and Tenant Act 1985. It&rsquo;s therefore advised that landlords have some kind of coverage so that they can resolve any issues quickly and efficiently.&nbsp;</p>
<h3>What is covered by landlord insurance?</h3>
<p>This type of insurance protects all aspects of the landlord's property, from the building itself to the contents, appliances and utilities. In emergencies, landlord insurance may also include boiler breakdowns and burst pipes. However, it should be noted that landlord insurance may not cover maintenance of the boiler.</p>
<p>If you would like annual check-ups, then you&rsquo;ll need specialised boiler insurance cover.&nbsp;</p>
<h2>What is landlord's boiler cover?</h2>
<p><a href="https://www.boxt.co.uk/boilers/landlord-boiler-cover" rel="follow">Landlord boiler cover</a> is a plan that specifically covers the boiler in the event of a breakdown. This can cover the costs of hiring engineers for repairs or installers for any boiler replacements with no hassle.</p>
<p>This can be a great alternative to having the boiler covered on landlord insurance, as it can often increase premiums by a considerable amount without providing the same level of cover.</p>
<h3>What is included in landlord boiler cover?</h3>
<p>What's covered depends on the policy itself and the level of cover provided. &nbsp;A basic cover option will solely protect the boiler, or more expensive policies can cover the entire central heating system.</p>
<h2>What to consider when taking out landlord boiler cover</h2>
<p>If you are a landlord looking at boiler protection, there are several things you&rsquo;ll need to consider, for example:</p>
<ul>
<li><strong>The boiler&rsquo;s age - </strong>If your boiler is on the older side, it might be time to consider getting a newer model. Modern systems will have better energy efficiency ratings and are far more likely to be eligible for the most comprehensive landlord insurance policies.</li>
<li><strong>Claim cap - </strong>Some policies might have a cap on the number of times you are able to claim or use the emergency call-out service. It is also worth checking to see if there are any terms or conditions that will result in you having to pay a call-out charge.</li>
<li><strong>Check the cover - </strong>This might seem obvious, but taking the time to check everything that is covered will ensure that all parts and labour are covered so there are no nasty surprises.</li>
<li><strong>The premium - </strong>You might think that the more expensive the monthly premium is, the better the cover will be for you. That is not always the case. Ensure the policy meets your needs, and you aren't paying for cover you don't need.</li>
</ul>

Choose BOXT when updating your rental property's boiler

<h2>Final thoughts</h2>
<p>If you&rsquo;re a landlord, having the right insurance policies in place is essential for making sure that you&rsquo;re able to keep your tenants happy and avoid being left out of pocket if things go wrong. Boilers are one of the most important features of a home, whether it&rsquo;s an apartment, terraced house, or semi-detached property, so getting it covered against breakdowns and emergency repairs is worthwhile.&nbsp;</p>
<p>Here at BOXT, we&rsquo;re all about providing flexible, affordable boilers with expert support whenever you need it. Learn more about <a href="https://www.boxt.co.uk/boilers/guides/14-reasons-why-boxt-is-perfect-for-landlords" rel="follow">why our boilers and boiler subscription services are perfect for landlords</a> or <a href="https://www.boxt.co.uk/contact-us" rel="follow">speak to our friendly customer service team</a> for advice that&rsquo;s tailored to your needs.</p>

Does landlord insurance cover your boiler?

If your boiler is showing a 'pump overrun' code, there's no need to be alarmed. Read our guide to find out what this means and how you can solve it.

<p>After a long day of running your boiler, your home should be warm and toasty enough to switch it off. But when you double-check your boiler pump before heading off to bed, it's displaying a 'pump overrun' code or still running and making a slight noise</p>
<p>Before you start to worry that you'll have to <a href="https://www.boxt.co.uk/boilers/boiler-replacement" rel="follow">replace your boiler</a>, there are a few things you'll need to understand. You need to know what a pump overrun means, why it happens, and how to fix it if it's overrun for hours on end.</p>
<p>Luckily, that's where we come in. Our complete guide will provide you with everything you need to know about a pump overrun and what to do if you find a problem with your boiler.</p>
<h2>What does &lsquo;pump overrun&rsquo; mean?</h2>
<p>Pump overrun means that your boiler pump is cooling down and getting rid of residual heat. This is a normal function on most modern Standard boilers and will take around five to ten minutes to complete.</p>
<p>When your boiler is displaying a pump overrun code, it's more than likely because you have just turned your central heating system off. The pump overrun occurs when you have used hot water or when you have used your heating.</p>
<p>It's perfectly normal for your boiler to stay running for around ten minutes after switching it off.</p>
<p>In bigger (and older) boilers, the pump overrun feature is unnecessary. Instead, these models are built to handle the residual heat until it has dissipated.</p>
<p>A newer model will have a smaller heat exchanger, which cannot regulate residual heat as well as its counterparts.</p>
<h2>Why does central heating pump overrun happen?</h2>
<p>When <a href="https://www.boxt.co.uk/boilers/combi-boilers" rel="follow">combi boilers</a> are in pump overrun, they circulate the leftover hot water until it begins to cool down. It does this by circulating the hot water through a bypass valve within the boiler itself (not to be confused with a bypass radiator).</p>
<p>In short, a pump overrun is used to prevent any water from boiling inside the heat exchanger in the unit after use. When there is water boiling inside the heat exchanger, it can cause costly damage. If you have a standard boiler with S or Y-plan heating system usually in the airing cupboard, the pipework may include a bypass valve, this is usually located near the pump itself.</p>
<h2>My pump overrun is lasting a long time - is this normal?</h2>
<p>Usually, the process for a pump overrun will last for around ten minutes. But if you notice your boiler is still running for hours after you've turned it off, there may be another problem at hand.</p>
<p>These problems are easily diagnosed and only require a few steps to find the root of the issue. The most common causes of prolonged pump overruns are a defective thermostat or timer. However, it could also be a result of a faulty pump or a wiring issue (typically in a new pump).</p>
<h2>What&rsquo;s causing your boiler to be in constant overrun?</h2>
<h3>1. The central heating pump has a defective thermostat or timer</h3>
<p>When your boiler is constantly in overrun, the first thing to do is check the timer. A broken timer is fairly easy to spot and will usually result in standard functions taking much longer to complete. The timer will also not switch on or off at set intervals and can typically make a fair amount of noise.</p>
<p>If the timer isn't the issue, the other major cause of a continuous pump overrun is a broken or defective thermostat.</p>
<p>They have a network of zone valves, which are motorised valves that control the flow of the water. When the thermostat is changed, it opens specific valves to allow the water to flow through and heat up.</p>
<p>The easiest way to spot a faulty thermostat is to look out for high readings on the temperature gauge, excessive noise, or changes in temperature readings.</p>
<h3>2. The pump circuit board is broken</h3>
<p>Once you have eliminated broken thermostats or timers as the primary issue, you may want to check the pump circuit board (PCB). This board helps to control water pressure and water pumps. When a PCB stops working, there will be negative feedback loops that point to the source of the problem.</p>
<p>If you suspect that this is an issue, it's best not to try and take care of the problem yourself. Without proper knowledge of the boiler's components, trying to fix a damaged PCB could cause injury and other harm to you or your home.</p>
<h3>3. The pump has a wiring issue</h3>
<p>If you switch your pump off and you notice both the pump and the boiler are still running, it's a surefire sign that your boiler is experiencing a wiring issue. This usually happens when a new pump is installed incorrectly. It causes the pump to keep running because it doesn't detect the presence of hot water in the heat exchanger.</p>
<h2>How to fix a central heating pump overrun</h2>
<p>When it comes to <a href="https://www.boxt.co.uk/boilers/boiler-repair" rel="follow">repairing a boiler</a> that constantly has a pump overrun being executed, it's best to consult a professional. Most of these fixes require a good knowledge of the components and can possibly be dangerous if done incorrectly. So, you'll need to contact a Gas Safe registered engineer to conduct the boiler repair.</p>
<p>When they are repairing the central heating system, they can tell you what the problem is and the possible causes of the issue.</p>
<p></p>
<p></p>

<h2>Clear up any boiler confusion with BOXT</h2>
<p>Now that you know what a pump overrun means, there's no need to worry when it happens! After around five to ten minutes, the code should clear, and the pump should turn off.</p>
<p>But on the off-chance that the overrun code doesn't disappear, it's time to call a Gas Safe registered engineer. Remember not to try and fix the problem yourself, as this could potentially be dangerous.</p>

What does ‘boiler pump overrun’ mean?

A 10-year boiler warranty is common, but new boilers have a range of options for their warranty. 

<p>When you buy a <a href="https://www.boxt.co.uk/boilers/boiler-replacement">new boiler</a>, you want the assurance that you won't have to pay a fortune to fix it if something goes wrong, at least in the short term. And that&rsquo;s why boilers come with a warranty, similar to any other high-ticket item you might buy.</p>
<p>Typically, a warranty is a contract issued by the manufacturer to the client, a pledge to repair or replace the boiler within a specific time limit.</p>
<p>When you have a <a href="https://www.boxt.co.uk/boilers/boiler-installation">boiler installation</a>, the manufacturer gives you a warranty covering any problems with your new boiler for a certain amount of time.&nbsp;</p>
<p>And in this guide, we cover <a href="https://www.boxt.co.uk/boilers/boiler-warranty-guarantee">what a boiler warranty is</a>, the differences between a warranty and a guarantee, and compare most boiler warranties for a range of boiler brands, including answering the commonly asked question of whether or not all boilers come with a 10-year warranty.</p>
<h2>What does a boiler warranty entail?</h2>
<p>A boiler warranty is a written agreement by the manufacturer that promises to repair or replace a <a href="https://www.boxt.co.uk/boilers/boiler-replacement" rel="follow">new boiler</a> if&nbsp;it is faulty within a specific period of time.&nbsp;</p>
<p>When choosing a <a href="https://www.boxt.co.uk/boilers/boiler-replacement">new boiler</a>, it is also essential to consider the boiler warranty to go with it, as it could save you a substantial amount of money on <a href="https://www.boxt.co.uk/boilers/boiler-repair">repair</a> costs in the long term.</p>
<p>In the case of a breakdown or issue with your boiler, you can rest easy knowing that you'll be protected under your warranty terms. During the boiler's warranty term, the boiler manufacturer should repair or replace it if it is defective or a breakdown occurs.&nbsp;</p>
<h2>Boiler warranty vs boiler guarantee - What&rsquo;s the difference?</h2>
<p>A boiler warranty is a contract that stipulates someone will investigate the problem you are experiencing with your boiler, but there is no agreement to actually come out and fix the problem.</p>
<p>On the other hand, a boiler guarantee is an agreement that the manufacturer will send someone out to your property to investigate the problem and repair or <a href="https://www.boxt.co.uk/boilers/boiler-replacement" rel="follow">replace the boiler</a> if the problem is down to a manufacturing fault. Overall, people usually view boiler guarantees as superior because, with them, the boiler will get fixed and not just looked at.</p>
<p>Whether you choose a warranty or guarantee, you will want the terms to cover you for as long as possible so that you don&rsquo;t need to worry about what you would need to do in the case of a boiler emergency.</p>
<h2>What are the conditions of cover for boiler warranties?</h2>
<p>All boiler warranties are subject to a strict set of conditions that you must comply with, or you could invalidate your boiler warranty. The fine print may differ for each warranty, but three main conditions appear across all warranties that you need to adhere to so they remain valid.</p>
<ul>
<li>Your boiler must be&nbsp;installed by a Gas Safe registered engineer.</li>
<li>The&nbsp;warranty must be registered within 30 days of installation. When you get your boiler through BOXT, we register the warranty with the manufacturer for you, so you don't need to worry about missing the deadline!</li>
<li>You must have your boiler serviced <a href="https://www.boxt.co.uk/boilers/guides/need-an-annual-service-we-can-help">annually</a> by a Gas Safe Engineer. Ensure you get a certificate as proof that your boiler has been serviced.</li>
</ul>

<h2>Boiler warranty lengths by brand</h2>
<p>Boiler warranties will vary from manufacturer to manufacturer and will also depend on their ranges and models. There is no one-size-fits-all approach when it comes to manufacturer warranties, but all boiler brands typically have a standard warranty ranging from 2 to 10 years.&nbsp;</p>
<p>Here&rsquo;s how long the warranties are for some of the most common boiler brands, as provided by BOXT:</p>
<ul>
<li><strong>Worcester Bosch</strong>: 5-10 year warranty</li>
<li><strong>Ideal</strong>: 5-12 year warranty</li>
<li><strong>Baxi</strong>: 3-7 year warranty</li>
<li><strong>Vaillant</strong>: 5-10 year warranty</li>
<li><strong>Navien</strong>: 5-10 year warranty</li>
</ul>
<p>Considering all these brands, it could be argued that Worcester Bosch has the best boiler warranties in terms of value as they offer a guarantee and a 10-year term as standard. This means you will have the peace of mind that if anything should happen to your boiler in that time, you will be able to get it fixed without extra cost.</p>
<h2>Checklist for your boiler warranty</h2>
<p>Not every warranty is the same. If you want more peace of mind, you might want to think about how good the manufacturer's warranty is when you buy a <a href="https://www.boxt.co.uk/boilers/boiler-replacement" rel="follow">new boiler</a>. There are three main factors to consider when looking for the best boiler warranty for you:</p>
<h3><span style="font-size: 13pt;">1. How long is the boiler warranty?</span></h3>
<p>New boilers tend to be very dependable during their first few years, but the longer the boiler warranty term lasts, the longer you'll have the peace of mind that any defects that may develop are likely to be covered. When shopping for a <a href="https://www.boxt.co.uk/boilers/boiler-replacement">new boiler</a>, be sure to check how long the warranty is on your chosen model.</p>
<h3><span style="font-size: 13pt;">2. Which parts are covered by the boiler warranty?&nbsp;</span></h3>
<p>Some warranties may require you to pay an additional cost for parts and labour, especially if the heating engineer needs to get ahold of manufacturer-approved parts. Others will need a deposit for any service call, which will only be repaid if the warranty covers the problem.&nbsp;</p>
<p>Keeping up with your annual <a href="https://www.boxt.co.uk/boilers/boiler-servicing" rel="follow">boiler service</a> will enable you to catch boiler problems sooner and so will reduce the cost of only manufacturer-approved parts and labour costs during a breakdown.</p>
<h3 style="margin-top: 12pt; margin-bottom: 12pt;"><span style="font-size: 13pt;">3. What are the boiler warranty exclusions?</span></h3>
<p>Check the boiler warranty terms and conditions for any other exclusions that might void the manufacturer's warranty. Some warranty periods may have some special terms and conditions not mentioned in this article. Hence, you must check all standard warranty and extended warranty conditions with the manufacturer before choosing the best warranty for you and your boiler.</p>
<h2><strong>Final thoughts</strong></h2>
<p>If you&rsquo;re ready to choose a new boiler and want to select a model with the best-suited warranty for you, find out more about the <a href="https://www.boxt.co.uk/boilers/boiler-warranty-guarantee">BOXT boiler warranty guarantee</a> when you choose us for boiler installation. Or, if you're still deciding which boiler brand would be best for your home, take a look at our boiler comparison guides, like <a href="https://www.boxt.co.uk/boilers/guides/baxi-vs-worcester-bosch" rel="follow">Baxi vs. Worcester Bosch boilers</a> and <a href="https://www.boxt.co.uk/boilers/guides/ideal-vs-baxi" rel="follow">Ideal vs. Baxi boilers</a>.&nbsp;</p>
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