How much does it cost to fix boiler error code FAILURE TO LIGHT?

Typical repair cost for the boiler FAILURE TO LIGHT fault is £120-350 including labour.

FAILURE TO LIGHT High

Boiler Fault Code FAILURE TO LIGHT

Also written as FAILURETOLIGHT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code FAILURE 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 not firing up because it isn't receiving the correct signal from your thermostat or internal controllers to start the heating process. (As reported on Johnson Starley Warmcair DW)

Pick your boiler brand for the FAILURE TO LIGHT fix

Johnson Starley FAILURE TO LIGHT 1 model

Source

Information for the FAILURE 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