BoilerFaultCodes E2 / 223 High
Boiler Fault Code E2 / 223
Also written as E2223 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E2 / 223 appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has lost its connection to the heat sensor, meaning it cannot tell how hot the water is and has safely shut down to prevent overheating. (As reported on Worcester Bosch Greenstar i)
Pick your boiler brand for the E2 / 223 fix
Source
Information for the E2 / 223 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