BoilerFaultCodes E9 220 High
Boiler Fault Code E9 220
Also written as E9220 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E9 220 appears across 1 boiler brand and 10 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 water inside has become dangerously hot or the sensor itself has developed a fault. (As reported on Worcester Bosch 35 RSF)
Pick your boiler brand for the E9 220 fix
Source
Information for the E9 220 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