BoilerFaultCodes Burner fails to light High
Boiler Fault Code Burner fails to light
Also written as BURNERFAILSTOLIGHT — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Burner fails to 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 failing to light the gas burner and has gone into a safety lockout mode to prevent unburned gas from building up. (As reported on Ideal Concord Super Series 4)
Pick your boiler brand for the Burner fails to light fix
Source
Information for the Burner fails to 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