BoilerFaultCodes F44 High
Boiler Fault Code F44
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F44 appears across 1 boiler brand and 4 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has lost the ability to accurately measure the temperature of the water circulating back into it, so it has shut down as a precaution to prevent overheating. (As reported on Ferroli Optimax 25 C)
Pick your boiler brand for the F44 fix
Source
Information for the F44 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