BoilerFaultCodes D.164 Low
Boiler Fault Code D.164
Also written as D164 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code D.164 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 is currently identifying the specific way its exhaust pipe is set up, which is a normal part of the system's configuration process rather than a breakdown. (As reported on Vaillant ecoTEC Plus 836)
Pick your boiler brand for the D.164 fix
Source
Information for the D.164 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