BoilerFaultCodes 422 High
Boiler Fault Code 422
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 422 appears across 1 boiler brand and 1 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 water leaving the unit is freezing or at an impossibly low temperature, which has caused it to shut down to prevent damage. (As reported on ECA FELiS FL 50 HM)
Pick your boiler brand for the 422 fix
Source
Information for the 422 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