BoilerFaultCodes B-2 Low
Boiler Fault Code B-2
Also written as B2 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code B-2 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 correctly registering that a hot tap is turned on and is preparing to provide hot water. (As reported on Ferroli Optima 201)
Pick your boiler brand for the B-2 fix
Source
Information for the B-2 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