Boiler Fault Code Pilot On

Also written as PILOTON — same fault.

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

Fault code Pilot On appears across 1 boiler brand 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 struggling to keep its small pilot flame lit, which prevents the main heating system from starting up. (As reported on Baxi Solo PF)