Boiler on Low

Boiler Fault Code Boiler on

Also written as BOILERON — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code Boiler on appears across 2 boiler brands and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is working normally and the light simply indicates it is switched on and firing. (As reported on Ideal Concord CXA 40-120)

Pick your boiler brand for the Boiler on fix

Baxi Boiler on 3 models Ideal Boiler on 2 models

Source

Information for the Boiler on 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