F22 High

Boiler Fault Code F22

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code F22 appears across 4 boiler brands and 34 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has detected that there is not enough water pressure in the system to operate safely, which has caused it to shut down. (As reported on Glow-worm Flexicom 18sx)

Pick your boiler brand for the F22 fix

Glow-worm F22 25 models Heatline F22 2 models Ideal F22 1 model Vaillant F22 6 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 31 August 2026