How much does it cost to fix boiler error code Flame Failure (Red Light) ON?

Typical repair cost for the boiler Flame Failure (Red Light) ON fault is £120-250 including labour.

Flame Failure (Red Light) ON High

Boiler Fault Code Flame Failure (Red Light) ON

Also written as FLAMEFAILUREREDLIGHTON — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code Flame Failure (Red Light) ON appears across 1 boiler brand and 4 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has stopped working because it couldn't safely ignite its internal flame, which means your heating and hot water have turned off as a safety precaution. (As reported on Baxi Combi 105 HE)

Pick your boiler brand for the Flame Failure (Red Light) ON fix

Baxi Flame Failure (Red Light) ON 4 models

Source

Information for the Flame Failure (Red Light) ON 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