How to reset a Vaillant Boiler

A Vaillant boiler that’s not turning on is not ideal, but many modern appliances are designed to ‘lockout’ when there’s a fault or risk to your safety. There could be unsafe conditions to keep operating such as a bad supply of gas, or a fault in the system.

Possible reasons for a lockout-

  1. Water pressure
  2. Ignition failure
  3. Heat exchanger blocked

Resetting your Vaillant Boiler

  • To reset the boiler manually, press the reset button (3) and hold for one second.
How to reset a Vaillant Boiler
How to reset a Vaillant Boiler

There are several reasons why you might want to reset your Vaillant boiler:

  1. Troubleshooting: If you are experiencing issues with your Vaillant boiler, such as it not heating water or not firing up, resetting the boiler may help to resolve these issues.
  2. Changing configurations: If you want to make changes to the configuration of your Vaillant boiler, such as adjusting the temperature settings or changing the time clock, resetting the boiler can help you start with a fresh configuration.
  3. Factory reset: If you are planning to sell or give away your Vaillant boiler, or if you want to restore the boiler to its original factory settings, resetting the boiler can help you achieve this.

If you are unable to resolve the ignition problem yourself by resetting the boiler three times, consult a professional.

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