BoilerFaultCodes Lockout (Red) High
Boiler Fault Code Lockout (Red)
Also written as LOCKOUTRED — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Lockout (Red) appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler's burner has stopped working and has gone into a safety shutdown mode to prevent further damage. (As reported on Firebird Enviro Combi 26)
Pick your boiler brand for the Lockout (Red) fix
Source
Information for the Lockout (Red) 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