BoilerFaultCodesVaillant d.96 Fault Code
Also written as D96 — same fault.
The Vaillant d.96 fault code means: your boiler is currently resetting itself to its original factory configuration, which is a standard procedure that usually occurs during an initial setup or after a system update.. It appears on 10 Vaillant models in our database.
Technical description: Factory setting
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.96 fault code
Click a model for the full fault code list and model-specific repair notes.
- ecoFIT Pure 418 Repair: £120-250
- ecoFIT Pure 425 Repair: £100-£180
- ecoFIT Pure 825
- ecoFIT Pure 830 Repair: £100-200
- ecoFIT Pure 835 Repair: £90-150
- ecoTEC plus VU GB 656/4-5 A Repair: £120-200
- ecoTEC sustain Repair: £120-200
- Home Combi 25 Repair: £100-200
- Home Combi 30 Repair: £100-200
- Home Combi 35 Repair: £100-200
Source
Vaillant d.96 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 425 manual (PDF)
- Vaillant ecoFIT Pure 835 manual (PDF)
- Vaillant ecoTEC plus VU GB 656/4-5 A manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026