BoilerFaultCodes 274 Medium
Boiler Fault Code 274
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 274 appears across 1 boiler brand and 4 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 signal that suggests the flame sensor is picking up activity when it shouldn't be, which may indicate a faulty control board or moisture. (As reported on Worcester Bosch 24/28/35 CDi MkII)
Pick your boiler brand for the 274 fix
Source
Information for the 274 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