BoilerFaultCodes Burner lock out indicator High
Boiler Fault Code Burner lock out indicator
Also written as BURNERLOCKOUTINDICATOR — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Burner lock out indicator appears across 1 boiler brand and 4 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 properly, so it has safely shut itself down to prevent gas from building up. (As reported on Vaillant Thermocompact)
Pick your boiler brand for the Burner lock out indicator fix
Source
Information for the Burner lock out 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 7 July 2026