BoilerFaultCodes Red lockout indicator High
Boiler Fault Code Red lockout indicator
Also written as REDLOCKOUTINDICATOR — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Red lockout indicator 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 has failed to light the flame, so it has safely shut itself down to prevent gas from building up. (As reported on Chaffoteaux 80/100)
Pick your boiler brand for the Red lockout indicator fix
Source
Information for the Red 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