BoilerFaultCodes main burner operating High
Boiler Fault Code main burner operating
Also written as MAINBURNEROPERATING — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code main burner operating 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 electronic control system is stuck in an error state while trying to fire up the main burner, meaning it cannot safely provide heating or hot water. (As reported on Glow-worm Ultimate)
Pick your boiler brand for the main burner operating fix
Source
Information for the main burner operating 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