BoilerFaultCodes Boiler lockout High
Boiler Fault Code Boiler lockout
Also written as BOILERLOCKOUT — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Boiler lockout 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 light the internal flame after several attempts, so it has purposefully locked itself for safety. (As reported on Ferroli Arean)
Pick your boiler brand for the Boiler lockout fix
Source
Information for the Boiler 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 27 April 2026