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No hot water? Simple checks to diagnose the problem

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You’ve got into the shower only to realise that the water doesn’t appear to be heating up. It’s common, inconvenient, and frustrating to say the least - but don’t fret, help is at hand. 

Sometimes it’s not the end of the world when your hot water isn’t working as it should be. That’s why we’ve come up with a few simple checks you can do before you call an engineer. Hopefully in this guide, you’ll be able to find out what the problem is and the best thing for you to do.


Check your water pressure.

Low water pressure is a common problem but not necessarily a serious one. The sweet spot for your boiler to be working properly is between 1 and 1.5 bar. When your pressure is low all you need to do is top it back up again. 

There are different ways you can repressurise your boiler and it all depends on what type and style of boiler you have. Generally, you will need to twist the filling loop or key. The newer Worcester Bosch models require you to simply pull a blue lever down. For everything you need to know about topping up your boiler pressure, check out this guide: https://www.boxt.co.uk/boilers/guides/boiler-pressure 

Unfortunately, if your water pressure continues to drop after you repressurise, then this indicates there’s a potential leak somewhere in your system. At this point there’s nothing else you can do a part of contacting an engineer for a call out. 

Is your thermostat on?

When temperatures drop over winter it can sometimes lead to us forgetting what temperature our thermostat is at or whether it’s on at all. The ideal temperature for a home is between 19°- 22°, anything lower you’re probably unlikely to notice it’s actually on. Moreover, a quick of checking if your thermostat is working is by feeling around your radiators. It may even be an issue with your radiators, if so, you’ll need to bleed them. 

Alternatively, if your home is still freezing cold then it may be an electrical fault with your thermostat. Therefore, you should contact an electrician to go and take a look at it for you as this isn’t something you’ll be able to fix yourself. 

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Reset your boiler.

It may seem quite an obvious thing to do but every now and then, technology needs a quick reboot to start operating competently again. Resetting your boiler is most commonly carried out when there’s a boiler lockout. Your boiler does this when it notices an issue within your system and can be a whole list of reasons why. 

But how do you reset your boiler? Again, it can vary depending on your boiler model but for modern boilers it tends to be a button that simply reads, ‘reset’. Press and hold for three seconds then release. For further help, try and dig your boiler’s instruction manual - there it’ll explain exactly how to reset your boiler and even little diagrams so you’ll know exactly what to look for. 

If your boiler doesn’t return to normal once you’ve reset it, the best thing to do is to contact an engineer and they’ll be able to take a further look at it. 

Potential frozen pipe.

Depending on what the weather is like outside, a frozen condensate pipe could be the reason as to why your hot water isn’t working. A couple of warning signs include: a weird gurgling sound coming from your boiler and if your boiler isn’t switching on. Consequently, this can lead to the pipes bursting and can result in leaking or flooding which is obviously serious.

The condensate pipe is a white pipe that’s located outside your property and should always lead into a drain. On the occasion that you do notice the pipe is frozen, you should fill up a jug with warm water (not boiling) and pour over the condensate pipe. Understandably, you may not feel comfortable doing this, if that’s the case then contact an engineer for a call out.

Everyone at BOXT is more than happy to talk you through this. Speak directly to one of our specialist engineers on, 0800 193 7777. 

Otherwise, you can drop us a message on our Live Chat where our expert engineer can offer you advice and guidance.

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Can you see a fault code? 

At first glance fault codes can look quite intimidating. A combination of numbers and letters thrown together at random it seems. The first thing to do is to not panic, it’s not the end of the world as some fault codes aren’t as daunting as they may appear. A quick solution is to bleed all the radiators in your property and reset your boiler, this should fix the issue. If you’re still not getting any hot water then it would be time to call out an engineer to take a further inspection. 

For a list of the most common fault codes for Worcester Bosch, check this out:https://www.boxt.co.uk/boilers/guides/worcester-fault-codes 

For a list of the most common fault codes for Ideal, check this out: https://www.boxt.co.uk/boilers/ideal-boiler-fault-codes 

All information correct as of 15/01/2021

If you enjoyed this guide, check out: https://www.boxt.co.uk/boilers/guides/boxts-tips-for-winter

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