Boiler Fault Code PILOT WILL NOT STAY ALIGHT

Also written as PILOTWILLNOTSTAYALIGHT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026

Fault code PILOT WILL NOT STAY ALIGHT appears across 1 boiler brand and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's small starter flame keeps blowing out or failing to stay lit, which prevents the main boiler from igniting and providing heating or hot water. (As reported on Chaffoteaux Britony II 30FF)