BoilerFaultCodes 337 High
Boiler Fault Code 337
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 337 appears across 1 boiler brand and 1 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 an internal electrical safety failure and has shut down to prevent damage or unsafe operation. (As reported on ECA FELiS FL 50 HM)
Pick your boiler brand for the 337 fix
Source
Information for the 337 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