31 High

Boiler Fault Code 31

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 31 appears across 12 boiler brands and 71 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 26 models Ariston 31 4 models Atag 31 1 model Chaffoteaux 31 6 models Ferroli 31 3 models Glow-worm 31 1 model Ideal 31 2 models Johnson Starley 31 10 models Ravenheat 31 8 models Remeha 31 3 models Saunier Duval 31 4 models Vokera 31 3 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 27 April 2026