BoilerFaultCodes IGNITION LOCKOUT INDICATOR High
Boiler Fault Code IGNITION LOCKOUT INDICATOR
Also written as IGNITIONLOCKOUTINDICATOR — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code IGNITION LOCKOUT INDICATOR appears across 1 boiler brand and 8 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 failed to light the flame, which usually happens due to a blocked flue, a frozen pipe, or a gas supply issue. (As reported on Halstead Best 80)
Pick your boiler brand for the IGNITION LOCKOUT INDICATOR fix
Source
Information for the IGNITION LOCKOUT INDICATOR 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