BoilerFaultCodes 431 High
Boiler Fault Code 431
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 431 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 a fault with its temperature sensor, which means the system cannot safely monitor the heat of the water and has stopped working as a precaution. (As reported on Ideal Ideal Classic SE15P FF)
Pick your boiler brand for the 431 fix
Source
Information for the 431 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