22 High

Boiler Fault Code 22

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 22 appears across 15 boiler brands and 42 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 the temperature sensors monitoring incoming and outgoing water have been swapped or are reading incorrectly, causing the system to stop for safety. (As reported on Unical Alkon R 28 HE)

Pick your boiler brand for the 22 fix

Alpha 22 1 model Atmos 22 4 models Baxi 22 2 models Biasi 22 2 models Daikin 22 3 models Gledhill 22 1 model Glow-worm 22 1 model Grant 22 6 models Intergas 22 11 models Main 22 2 models Malvern 22 1 model Sime 22 2 models Unical 22 2 models Vokera 22 3 models Warmworld 22 1 model

Source

Information for the 22 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 7 July 2026