The Vaillant 0020128697 Wiring Harness is a genuine Vaillant replacement cable harness for Vaillant boilers. The harness connects the boiler’s printed circuit board (PCB) to its internal components, such as sensors, pump, valves and switches, carrying power and signals between them.
A damaged, burnt or broken harness can cause intermittent faults, fault codes, components not responding, or the boiler not working at all. Replacing it with the genuine Vaillant harness restores safe and reliable electrical connections.
Key Features
- Genuine Vaillant part – Part No. 0020128697
- Factory-made harness with correct plugs and connectors
- Direct plug-in replacement – no modifications needed
- 1 year manufacturer guarantee
Compatibility
Vaillant wiring harnesses are model-specific. Please match the part number (0020128697) with your boiler’s spare parts list or your existing harness before ordering. If you are unsure, contact us with your boiler model and we will confirm the right part for you.
Specifications
| Brand | Vaillant |
| Part Number | 0020128697 |
| Type | Wiring Harness / Cable Harness |
| Condition | New – Genuine Vaillant |
| Guarantee | 1 year manufacturer guarantee |
Installation
This part must be fitted by a Gas Safe registered engineer. Always isolate the electrical supply before working on the boiler.
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