BoilerFaultCodes AA2222 High
Boiler Fault Code AA2222
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code AA2222 appears across 1 boiler brand and 3 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 that a internal water sensor is stuck in the 'on' position even when the pump isn't running, preventing the system from starting safely. (As reported on Ariston Genus 27)
Pick your boiler brand for the AA2222 fix
Source
Information for the AA2222 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