BoilerFaultCodes B08 Medium
Boiler Fault Code B08
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code B08 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's built-in timer or clock has encountered a communication error, meaning the heating may not turn on at your scheduled times. (As reported on Ariston Euro Combi 30 MFFI)
Pick your boiler brand for the B08 fix
Source
Information for the B08 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 7 July 2026