What does the Vaillant ecoTEC exclusive F27 fault code mean?
The F27 fault code on the Vaillant ecoTEC exclusive indicates a malfunction with the gas valve, which is responsible for regulating the flow of gas to the burner. This issue can prevent the boiler from igniting or operating efficiently.
Common Causes
- Faulty Gas Valve: The gas valve may be defective or damaged, leading to improper gas flow.
- Electrical Connection Issues: Poor wiring or connections to the gas valve can disrupt its operation, causing the fault code to appear.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer for any issues related to the gas valve, as working with gas appliances can be dangerous and requires professional expertise.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for a faulty gas valve on a Vaillant ecoTEC exclusive is approximately £350 to £450. This includes the cost of the replacement part and labour, as gas valves are specialised components that require professional installation.