How much does it cost to fix boiler error code FALSE FLAME LOCKOUT?

Typical repair cost for the boiler FALSE FLAME LOCKOUT fault is £150-300 including labour.

FALSE FLAME LOCKOUT Emergency

Boiler Fault Code FALSE FLAME LOCKOUT

Also written as FALSEFLAMELOCKOUT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code FALSE FLAME LOCKOUT appears across 3 boiler brands and 8 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has detected a flame inside when the system is supposed to be turned off, which is a safety mechanism triggered to prevent incorrect operation. (As reported on Johnson Starley Quantec C)

Pick your boiler brand for the FALSE FLAME LOCKOUT fix

Ideal FALSE FLAME LOCKOUT 4 models Johnson Starley FALSE FLAME LOCKOUT 2 models Keston FALSE FLAME LOCKOUT 2 models

Source

Information for the FALSE FLAME LOCKOUT 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