BoilerFaultCodes Heating demand light OFF High
Boiler Fault Code Heating demand light OFF
Also written as HEATINGDEMANDLIGHTOFF — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Heating demand light OFF 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 is currently idle because it is not receiving a signal from your thermostat or timer to turn the heating on. (As reported on Ferroli Falcon)
Pick your boiler brand for the Heating demand light OFF fix
Source
Information for the Heating demand light OFF 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