Category - Boilers
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Will Scholfield, Engineer

13 Nov : Updated 19 Feb ● 3 min read

How to reset a Navien boiler

Whether you've had your Navien boiler for a few years or weeks, you will likely need to reset it at some point in its lifespan.

To ensure the efficiency and proper maintenance of your Navien boiler, you must understand what to do when an error message appears and when to press the reset button.

This guide explains everything you need to know about resetting your Navien boiler and ensuring you always have heating and hot water.

Where is the reset button on a Navien boiler?

Typically, the reset button on a Navien boiler will be on its front panel, near the control display. 

The reset button's precise position on your boiler unit will vary based on the Navien model you own, so it's a good idea to check the instruction manual for the exact location.

When to reset a Navien boiler

Occasionally, your boiler may experience faults that require you to press the reset button. If there's a problem with your boiler, like a faulty heat exchanger or water heater, it can shut down completely, known as a 'lockout'.

A boiler will perform a lockout to preserve your safety and avoid a more severe fault occurring. When this happens, you should perform a system reset. Additionally, you may have to reset your boiler if there's a problem with the power supply or a power cut.

You should be aware that resetting your Navien boiler may not fix the issue, and you may need to contact technical support or a Gas Safe registered engineer to investigate the problem further. Where this is the case, the control panel or screen may show an error message or code you can look up in your Navien boiler's instructions.

As with all machines, a mechanical or electrical fault can occur at any time, so it's so essential you get your boiler serviced regularly.

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Can you reset a Navien boiler yourself?

Resetting your boiler is a straightforward process, so if you feel confident doing it, you can save time and money by doing it yourself. Before you do, read your boiler's manual. You must also wait before pressing the reset button again, as pressing it multiple times in quick succession could cause further problems.

How to reset a Navien boiler

Specific reset processes will vary based on the model of the Navien boiler you own. To help you, we've outlined the steps to resetting different Navien models below.


To reset a Navien NCB300, press the Power button. If this doesn't work, refer to the troubleshooting section of the instruction manual.

LCB700, NCB700 & NCB500

Press the Back button to reset an NCB500 boiler. If this doesn't work, contact Navien tech support or consult the manual's troubleshooting section.


Press the Reset button on the system's front panel if an error code appears.

What happens after you reset your Navien boiler?

Depending on the extent of the problem, your Navien boiler will either show an error code on its panel display or resolve the issue automatically and get straight back to working as expected.

If your boiler reset has gone to plan, the boiler will fire up as expected, and any error messages will disappear. The reset procedure can take a couple of minutes, so avoid pressing the reset button multiple times - this can cause further complications.

When to call a professional

If you press the reset button and the error code persists, contact a trained professional for boiler repairs. You should report any problems quickly so an engineer can fix them before they worsen.

For more boiler maintenance advice, check out our blog's dedicated section. Here, you'll find tips and information on everything, from how to clear an airlock to how to clean a magnetic filter and more.