BoilerFaultCodes 220 / E9 High
Boiler Fault Code 220 / E9
Also written as 220E9 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 220 / E9 appears across 1 boiler brand and 1 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 an electrical fault with a safety component, causing it to shut down to prevent potential overheating. (As reported on Worcester Bosch Greenstar CDi Compact)
Pick your boiler brand for the 220 / E9 fix
Source
Information for the 220 / E9 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