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 4 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 the small pilot flame that starts the heating process is not staying lit or will not spark. (As reported on Potterton Main Mersey Super)
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 27 April 2026