BoilerFaultCodesVaillant d.07 Fault Code
Also written as D07 — same fault.
The Vaillant d.07 fault code means: your boiler is displaying a status code relating to its internal hot water temperature settings, which often occurs when the system is just monitoring its current operation rather than indicating a breakdown.. It appears on 17 Vaillant models in our database.
Technical description: 1. Vantage hot water temperature (not applicable) 2. Warmstart temperature setting (applies to turboMAX plus only)
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.07 fault code
Click a model for the full fault code list and model-specific repair notes.
- ecoFIT Pure 418
- ecoFIT Pure 425
- ecoFIT Pure 435
- ecoFIT Pure 825
- ecoFIT Pure 830
- ecoFIT Pure 835
- ecoTEC sustain
- Home Combi
- Home System
- Thermocompact
- Turbomax 824/828
- Turbomax Plus Repair: £120-220
- Turbomax Plus 824/828E
- Turbomax Plus 828 Repair: £120-200
- Turbomax Plus 828 E Repair: £120-220
- Turbomax Plus VUW 242E Repair: £120-200
- Turbomax Plus VUW 242EH
Source
Vaillant d.07 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