BoilerFaultCodes F.41 High
Boiler Fault Code F.41
Also written as F41 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F.41 appears across 1 boiler brand and 17 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 its memory regarding the type of gas it uses and needs to be reconfigured by a professional to operate safely. (As reported on Vaillant Thermocompact)
Pick your boiler brand for the F.41 fix
Source
Information for the F.41 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