BoilerFaultCodes E9 285 High
Boiler Fault Code E9 285
Also written as E9285 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E9 285 appears across 1 boiler brand and 11 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 it has detected that the water temperature is becoming dangerously hot, which usually means the water isn't moving through the system properly. (As reported on Worcester Bosch 24 RSF)
Pick your boiler brand for the E9 285 fix
Source
Information for the E9 285 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