Boiler Fault Code d.22

Also written as D22 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026

Fault code d.22 appears across 3 boiler brands and 37 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning This code is not actually an error; it simply confirms that your boiler is currently detecting a request for hot water and is working correctly to heat it up for your taps. (As reported on Glow-worm Energy7 Combi)