37 High

Boiler Fault Code 37

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 37 appears across 9 boiler brands and 61 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 that a sensor monitoring the temperature of the water returning to the unit is giving an incorrect reading or has failed, causing the system to stop working as a safety precaution. (As reported on Glow-worm EnergySaver Combi)

Pick your boiler brand for the 37 fix

Alpha 37 24 models Ferroli 37 3 models Glow-worm 37 1 model Halstead 37 8 models Ideal 37 2 models Johnson Starley 37 6 models Remeha 37 10 models Saunier Duval 37 4 models Vokera 37 3 models

Source

Information for the 37 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