31 High

Boiler Fault Code 31

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 31 appears across 17 boiler brands and 80 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 a temperature sensor and has shut down as a safety precaution, meaning you currently have no heating or hot water. (As reported on Glow-worm EnergySaver Combi)

Pick your boiler brand for the 31 fix

Alpha 31 25 models Ariston 31 4 models Atag 31 1 model Baxi 31 5 models Chaffoteaux 31 5 models Ferroli 31 4 models Gledhill 31 1 model Glow-worm 31 1 model Grant 31 6 models Ideal 31 3 models Johnson Starley 31 5 models Main 31 2 models Potterton 31 3 models Ravenheat 31 6 models Remeha 31 3 models Saunier Duval 31 2 models Vokera 31 4 models

Source

Information for the 31 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