How much does it cost to fix boiler error code Flame Lock-out?

Typical repair cost for the boiler Flame Lock-out fault is £120-250 including labour.

Flame Lock-out High

Boiler Fault Code Flame Lock-out

Also written as FLAMELOCKOUT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Flame Lock-out appears across 2 boiler brands 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 has stopped working because it cannot light the internal flame, which means you currently have no heating or hot water. (As reported on Potterton Kingfisher MF RSL)

Pick your boiler brand for the Flame Lock-out fix

Potterton Flame Lock-out 1 model Worcester Bosch Flame Lock-out 1 model

Source

Information for the Flame Lock-out 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