FUSE High

Boiler Fault Code FUSE

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code FUSE appears across 2 boiler brands and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has stopped working because an internal electrical safety fuse has blown, meaning the system is unable to power its essential controls. (As reported on Alpha Cd50s Cd70s)

Pick your boiler brand for the FUSE fix

Alpha FUSE 1 model Ideal FUSE 1 model

Source

Information for the FUSE 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 31 August 2026