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Witten by Bernard Morgan (Engineer) & Adam Apperley (Marketing). Published: January 24, 2024. Updated: May 17, 2024

F24 Vaillant Fault Code – How to fix

Encountering an F24 error code on your Vaillant boiler can be worrying, but understanding what it signifies is the first step towards a solution. This post aims to demystify the F24 error code, outlining its causes, potential fixes, and when to call in a professional.

  • The F24 error code indicates a problem related to the boiler’s heating system.
  • Common causes include issues with the water circulation or temperature sensors.
  • Some fixes can be DIY, but others require professional intervention.

Understanding the F24 error code

When the F24 error appears, it’s a signal that your boiler is unable to maintain a consistent heating operation. Normally it is because water is not circulating around your radiators. The boiler will shut down to protect itself and ensure it doesn’t run dry.

Cause of the F24 error

Circulation issue. If the water in your heating system isn’t circulating properly, it can lead to uneven heating and trigger the F24 code. This could be due to a faulty pump or blockages in the system.

It’s worth knowing that a faulty pump could cost quite a lot to repair or replace, depending on the model. A new boiler replacement would give you a new 10-12 year warranty and peace of mind.

DIY fixes vs. professional repairs

Minor issues, like resetting the boiler or checking for obvious blockages, can be handled by owners. But more complex problems require professional, Gas Safe registered engineers. For instance, replacing a malfunctioning pump or repairing a faulty sensor should be done by a Gas Safe registered engineer to ensure your safety.

Airlocks are something you can try and fix yourself, try bleeding the radiators.

When to call a professional

If the basic troubleshooting steps don’t resolve the F24 error, it’s time to call in a professional. Continuing to operate a boiler with this error can lead to increased wear and tear, higher energy costs, and even safety risks.


The Vaillant F24 error code is a clear indicator that your boiler needs attention. By understanding the potential causes and knowing when to seek professional help, you can ensure that your boiler continues to operate. Remember, regular maintenance is key to preventing such issues and prolonging the life of your boiler.

Unfortunately, your boiler may be unrepairable. If this is the case, get a boiler replacement quote for a premium boiler with Boilerhut:

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