The Ultimate Guide to Resetting Your Boiler

May 03, 2023 | News

How to reset my boiler guide

In this comprehensive guide, we’ll explore everything you need to know about resetting your boiler, common causes of boiler lockouts, and how to address issues related to boiler faults.

Locating the Boiler Reset Button

To reset your boiler, you’ll first need to find the boiler reset button. The most common location is near the display screen. However, some boilers may use a reset dial instead of a button. Consult your instruction manual for specifics.

How to Reset Your Boiler

Before resetting your boiler, ensure you’ve resolved the cause of the lockdown. Check the boiler error code on the display screen and use your instruction manual to understand the issue it represents. Except for minor fixes (e.g., defrosting condensate pipes, bleeding radiators, or topping up pressure), all errors should be assessed by a Gas Safe Registered (GSR) engineer. After resolving the issue, follow these steps:

  1. Locate the boiler reset button
  2. Press and hold the reset button for no more than 10 seconds
  3. Check if the flame has ignited or if the error code has disappeared
  4. Test the boiler by checking hot water or increasing the temperature

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Resetting a Vaillant Boiler

For Vaillant boilers, follow the same steps as mentioned above. The only difference is the duration of pressing the reset button. Locate the reset button on the boiler’s display, which will likely show a flame with a line crossed through it. Press the reset button for three seconds before the boiler resets and the display screen changes. Check your Vaillant boiler manual, as some models may have slightly different reset instructions.

Troubleshooting Boiler Issues after Resetting

Some boilers may take several minutes to reset or may require two attempts. If your boiler doesn’t turn on after resetting, or the error code persists, contact a GSR engineer.

Common Reasons for Boiler Lockouts

If you frequently need to reset your boiler, consult a GSR engineer to determine the cause of the frequent lockouts. Common reasons for boiler lockouts include:

  • Ignition failure or gas supply issues: Blockages in the flue, faulty gas valves, or issues with the ignition lead can cause gas supply or ignition failure. A GSR engineer should address these issues before resetting the boiler.
  • Low pressure: If the water pressure drops below 1.5 on your pressure gauge, repressurize your boiler according to the system’s manual. If you find a leak, contact a GSR engineer.
  • High pressure: If the pressure gauge reads above 2.5, bleed the radiators. This may resolve the issue without needing to reset the boiler. If the problem persists, contact a GSR engineer.
  • Boiler overheating: Blocked pipes or a failed pump can cause


Resetting a Boiler after Gas Supply Runs Out

If you have a pay-as-you-go meter and your boiler shuts down due to a lack of gas, follow the standard boiler reset steps once you have topped up your meter. In most cases, you can add emergency gas to your meter if necessary.


In summary, resetting a boiler is a straightforward process that involves holding down a button or turning a dial for a few seconds. However, it’s essential to address any error codes and underlying issues before attempting to reset your boiler. Regular boiler lockouts may indicate a more significant problem that requires a professional’s attention. Always consult a Gas Safe Registered engineer for any boiler-related issues that you cannot resolve yourself.

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