BoilerFaultCodes D.093 Medium
Boiler Fault Code D.093
Also written as D093 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code D.093 appears across 1 boiler brand and 7 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler's internal computer settings have not been configured correctly to match the specific model, meaning it does not know how to operate properly. (As reported on Vaillant ecoTEC Pro)
Pick your boiler brand for the D.093 fix
Source
Information for the D.093 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