BoilerFaultCodes 1. PILOT WILL NOT LIGHT High
Boiler Fault Code 1. PILOT WILL NOT LIGHT
Also written as 1PILOTWILLNOTLIGHT — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 1. PILOT WILL NOT LIGHT 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 is unable to start its small internal flame, meaning the main heating system cannot turn on. (As reported on Ideal WLX RS50 / RS60)
Pick your boiler brand for the 1. PILOT WILL NOT LIGHT fix
Source
Information for the 1. 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 7 July 2026