Vaillant Combi Boiler

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Vaillant boiler error code F75

Hello Guys,

I have bought and installed my Vaillant boiler five years ago. Overall, I am satisfied with the performance of the boiler. Moreover, I have not faced any kind of severe issue but from last two days, the boiler is displaying a F75 error code. I tried restarting the boiler several times but fortunately, the problem persists. What should I do?

Thanks in advance


Hi Bill,

The fault code F75 is considered as the most common issue among Vaillant boilers. The F75 fault code deals with the following errors according to the boiler’s user manual:

  • Faulty pressure sensor
  • Faulty central heating pump
  • Or sometimes both

In order to diagnose the existing fault in a better way, you should call a Vaillant boiler engineer.

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