BoilerFaultCodes E9 318 High
Boiler Fault Code E9 318
Also written as E9318 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E9 318 appears across 1 boiler brand and 9 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has shut down because a safety sensor has detected that the exhaust gases are getting too hot or the sensor itself has lost its electrical connection. (As reported on Worcester Bosch 26 CDi Xtra)
Pick your boiler brand for the E9 318 fix
Source
Information for the E9 318 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