BoilerFaultCodes A22 High
Boiler Fault Code A22
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code A22 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 an issue where it thinks water is still flowing even when it should have stopped, which is preventing it from operating correctly. (As reported on Ariston Genus 24 MFFI)
Pick your boiler brand for the A22 fix
Source
Information for the A22 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