Vaillant Combi Boiler

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Vaillant boiler F27 fault

Hello Everyone,

My newly bought Vaillant boiler is showing a F27 error code since last night. I have tried to fix the issue after reading the user manual but I guess I am lacking somewhere. Someone please help me to fix the problem.



Hi Ray, I would like to mention that your Vaillant boiler is showing up the F27 error code due to several reasons such as:

  • The boiler’s PCB is having an issue or not working properly
  • The defective flame sensor
  • The faulty gas valve

The F27 fault is definitely not as easy & simple to troubleshoot. The proficient Vaillant boiler engineer will has to come for inspecting your boiler & its internal parts in order to diagnose the exact problem.

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