BoilerFaultCodes All operation lights OFF High
Boiler Fault Code All operation lights OFF
Also written as ALLOPERATIONLIGHTSOFF — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code All operation lights OFF 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 appears to have no power and is completely unresponsive when you try to use your heating or hot water. (As reported on Biasi Riva Compact HE M96a)
Pick your boiler brand for the All operation lights OFF fix
Source
Information for the All operation lights 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