BoilerFaultCodes S.7 High
Boiler Fault Code S.7
Also written as S7 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code S.7 appears across 1 boiler brand and 26 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is struggling to circulate water properly after turning off the heating, which is likely caused by a blockage or a pump issue. (As reported on Vaillant ecoTEC 65kW)
Pick your boiler brand for the S.7 fix
Source
Information for the S.7 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