LED 1 Lit, LED 2 Off High

Boiler Fault Code LED 1 Lit, LED 2 Off

Also written as LED1LITLED2OFF — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code LED 1 Lit, LED 2 Off 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 encountered a serious internal error and has safely shut itself down to prevent damage, meaning you currently have no heating or hot water. (As reported on Glow-worm Micron 30ff)

Pick your boiler brand for the LED 1 Lit, LED 2 Off fix

Glow-worm LED 1 Lit, LED 2 Off 1 model

Source

Information for the LED 1 Lit, LED 2 Off 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