BoilerFaultCodes B7257 High
Boiler Fault Code B7257
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code B7257 appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler's internal computer or its identification chip has developed a communication failure, preventing the system from operating. (As reported on Worcester Bosch GB162)
Pick your boiler brand for the B7257 fix
Source
Information for the B7257 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