BoilerFaultCodes 317 High
Boiler Fault Code 317
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 317 appears across 2 boiler brands and 5 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 faulty connection in the sensor that monitors the temperature of the gases leaving your flue, meaning the boiler has safely shut down to prevent incorrect operation. (As reported on Worcester Bosch Greenstar 28CDi)
Pick your boiler brand for the 317 fix
Source
Information for the 317 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