BoilerFaultCodes B02 High
Boiler Fault Code B02
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code B02 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 not receiving a signal from your thermostat, which means your heating won't turn on even if you try to increase the temperature. (As reported on Ariston Eurocombi A/23 MFFI)
Pick your boiler brand for the B02 fix
Source
Information for the B02 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 31 August 2026