BoilerFaultCodes D.161 Low
Boiler Fault Code D.161
Also written as D161 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code D.161 appears across 1 boiler brand 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 has reached its scheduled annual service date, so it is simply reminding you that it is time for a professional maintenance check-up. (As reported on Vaillant ecoTEC Plus 832)
Pick your boiler brand for the D.161 fix
Source
Information for the D.161 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 7 July 2026