F22 High

Boiler Fault Code F22

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code F22 appears across 4 boiler brands and 35 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has stopped working because the water pressure is too low for it to run safely. (As reported on Vaillant Thermocompact)

Pick your boiler brand for the F22 fix

Glow-worm F22 10 models Heatline F22 8 models Saunier Duval F22 2 models Vaillant F22 15 models

Source

Information for the F22 fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026