BoilerFaultCodes Flame failure: lock out High
Boiler Fault Code Flame failure: lock out
Also written as FLAMEFAILURELOCKOUT — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Flame failure: lock out 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 has stopped working because it cannot light the flame or keep it burning, requiring a professional to check the gas supply and internal safety sensors. (As reported on Remeha Quinta 30)
Pick your boiler brand for the Flame failure: lock out fix
Source
Information for the Flame failure: 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