BoilerFaultCodes D.098 High
Boiler Fault Code D.098
Also written as D098 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code D.098 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 lost communication with a small plug-in component that tells it exactly which model it is, meaning it cannot operate until this identity connection is restored. (As reported on Vaillant ecoTEC Plus 832)
Pick your boiler brand for the D.098 fix
Source
Information for the D.098 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