BoilerFaultCodes d.37 High
Boiler Fault Code d.37
Also written as D37 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code d.37 appears across 1 boiler brand and 9 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is having trouble controlling the gas flow needed to heat your home, which means it will stop working until the electrical connection to the gas valve is repaired. (As reported on Vaillant Turbomax Plus VUW 242E)
Pick your boiler brand for the d.37 fix
Source
Information for the d.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 7 July 2026