BoilerFaultCodes Fuse 1 High
Boiler Fault Code Fuse 1
Also written as FUSE1 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Fuse 1 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 stopped working because a protective electrical fuse on the main internal computer has blown. (As reported on Glow-worm Swift Flow 100)
Pick your boiler brand for the Fuse 1 fix
Source
Information for the Fuse 1 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