Boiler Fault Code Reset light (illuminated)

Also written as RESETLIGHTILLUMINATED — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026

Fault code Reset light (illuminated) appears across 2 boiler brands and 11 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has become too hot and has automatically shut down to protect itself, usually because the water inside isn't circulating properly. (As reported on Glow-worm Micron 30ff)