BoilerFaultCodes Lockout Lamp High
Boiler Fault Code Lockout Lamp
Also written as LOCKOUTLAMP — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Lockout Lamp 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 detected a problem and safely shut itself down to prevent any further issues, meaning you currently have no heating or hot water. (As reported on Firebird Envirogreen)
Pick your boiler brand for the Lockout Lamp fix
Source
Information for the Lockout Lamp 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