BoilerFaultCodes 222 / E2 High
Boiler Fault Code 222 / E2
Also written as 222E2 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 222 / E2 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 is failing to detect the flow of water because an internal sensor is malfunctioning, which means it has safely shut down to prevent damage. (As reported on Worcester Bosch Greenstar CDi Compact)
Pick your boiler brand for the 222 / E2 fix
Source
Information for the 222 / E2 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