How much does it cost to fix boiler error code Main burner not operating (all neons lit)?

Typical repair cost for the boiler Main burner not operating (all neons lit) fault is £180-350 including labour.

Main burner not operating (all neons lit) High

Boiler Fault Code Main burner not operating (all neons lit)

Also written as MAINBURNERNOTOPERATINGALLNEONSLIT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code Main burner not operating (all neons lit) 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 detected a communication failure between its main computer and the firing controls, causing all the lights to stay on and the heating to stop working. (As reported on Protherm 40-50 CI)

Pick your boiler brand for the Main burner not operating (all neons lit) fix

Protherm Main burner not operating (all neons lit) 1 model

Source

Information for the Main burner not operating (all neons lit) 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