BoilerFaultCodes PILOT WILL NOT LIGHT High
Boiler Fault Code PILOT WILL NOT LIGHT
Also written as PILOTWILLNOTLIGHT — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code PILOT WILL NOT LIGHT appears across 2 boiler brands and 3 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 ignite because internal air is preventing the gas from reaching the burner correctly. (As reported on Chaffoteaux Celtic 2 24 Rsc)
Pick your boiler brand for the PILOT WILL NOT LIGHT fix
Source
Information for the PILOT WILL 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 31 August 2026