BoilerFaultCodesVaillant d.94 Fault Code
Also written as D94 — same fault.
The Vaillant d.94 fault code means: your boiler's memory of past technical issues has been cleared, which is a normal administrative task and not an indication of a current mechanical problem.. It appears on 8 Vaillant models in our database.
Technical description: Delete fault list
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Vaillant models that show the d.94 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vaillant d.94 fault code information on this page is sourced and cross-checked against the official Vaillant service / installation manuals for each affected model.
- Vaillant ecoFIT Pure 835 manual (PDF)
- Vaillant ecoTEC sustain manual (PDF)
- Vaillant Home Combi manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026