How much does it cost to fix boiler error code YELLOW FLAMES?

Typical repair cost for the boiler YELLOW FLAMES fault is £150-350 including labour.

YELLOW FLAMES Emergency

Boiler Fault Code YELLOW FLAMES

Also written as YELLOWFLAMES — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code YELLOW FLAMES appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is burning gas inefficiently, which is dangerous and can lead to the production of poisonous carbon monoxide gas. (As reported on Chaffoteaux Britony II 30FF)

Pick your boiler brand for the YELLOW FLAMES fix

Chaffoteaux YELLOW FLAMES 2 models

Source

Information for the YELLOW FLAMES 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