BoilerFaultCodes B01 High
Boiler Fault Code B01
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code B01 appears across 1 boiler brand and 6 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has switched itself off because it has reached an unsafe temperature and needs to cool down before it can be used again. (As reported on Ariston Euro Combi 30 MFFI)
Pick your boiler brand for the B01 fix
Source
Information for the B01 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