BoilerFaultCodes Boiler lock out High
Boiler Fault Code Boiler lock out
Also written as BOILERLOCKOUT — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Boiler lock out appears across 1 boiler brand and 3 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 for safety reasons and needs a manual reset after investigating potential blockages or gas supply issues. (As reported on Ferroli F 30 B)
Pick your boiler brand for the Boiler lock out fix
Source
Information for the Boiler 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 7 July 2026