BoilerFaultCodes 155 Emergency
Boiler Fault Code 155
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 155 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 has detected a dangerous problem with the flue or ventilation system, preventing it from safely removing exhaust gases. (As reported on Worcester Bosch WR325 RSF)
Pick your boiler brand for the 155 fix
Source
Information for the 155 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