S.97 Low

Boiler Fault Code S.97

Also written as S97 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code S.97 appears across 3 boiler brands and 41 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is temporarily pausing to check the system's water pressure before it starts up to provide heating or hot water. (As reported on Glow-worm Ultracom 24cx 30cx)

Pick your boiler brand for the S.97 fix

Glow-worm S.97 12 models Heatline S.97 8 models Vaillant S.97 21 models

Source

Information for the S.97 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