Pilot does not light High

Boiler Fault Code Pilot does not light

Also written as PILOTDOESNOTLIGHT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code Pilot does not light 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 is failing to start up because the small ignition flame is not lighting correctly. (As reported on Glow-worm Ultimate3 Combi)

Pick your boiler brand for the Pilot does not light fix

Glow-worm Pilot does not light 1 model Saunier Duval Pilot does not light 1 model

Source

Information for the Pilot does not light 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