Boiler Fault Code S.22

Also written as S22 — same fault.

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

Fault code S.22 appears across 2 boiler brands and 35 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is performing a routine self-check of the internal pump before starting the burner to ensure water is circulating correctly. (As reported on Glow-worm Flexicom cx)