41 High

Boiler Fault Code 41

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 41 appears across 9 boiler brands and 28 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's internal computer has developed a fault and can no longer communicate with the rest of the system safely. (As reported on Glow-worm EnergySaver Combi)

Pick your boiler brand for the 41 fix

Ferroli 41 3 models Glow-worm 41 1 model Grant 41 1 model Halstead 41 8 models Ideal 41 2 models Johnson Starley 41 6 models Remeha 41 2 models Saunier Duval 41 2 models Vokera 41 3 models

Source

Information for the 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