BoilerFaultCodes b22 High
Boiler Fault Code b22
Also written as B22 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code b22 appears across 1 boiler brand and 2 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 temperature sensors are reading back-to-front, which usually means there is a wiring issue or the water is flowing in the wrong direction. (As reported on Remeha Quinta 85)
Pick your boiler brand for the b22 fix
Source
Information for the b22 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