BoilerFaultCodes S.95 Low
Boiler Fault Code S.95
Also written as S95 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code S.95 appears across 2 boiler brands 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 is working fine, but it is currently waiting for a signal from the third heating zone's thermostat before it starts heating that area. (As reported on Viessmann Vitodens 222-F B2TF)
Pick your boiler brand for the S.95 fix
Source
Information for the S.95 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 31 August 2026