BoilerFaultCodes Burner Lockout D High
Boiler Fault Code Burner Lockout D
Also written as BURNERLOCKOUTD — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Burner Lockout D appears across 1 boiler brand 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's burner has stopped working for safety reasons, meaning the system cannot fire up to provide heating or hot water. (As reported on Firebird Enviro System)
Pick your boiler brand for the Burner Lockout D fix
Source
Information for the Burner Lockout D 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