What does the Vaillant ecoTEC plus F27 fault code mean?
The F27 fault code on the Vaillant ecoTEC plus indicates a problem with the gas valve, which is responsible for controlling the flow of gas to the burner. This issue can prevent the boiler from igniting or operating correctly, leading to heating and hot water supply problems.
Common Causes
- Faulty Gas Valve: The gas valve may be malfunctioning or completely failed, preventing proper gas flow.
- Electrical Issues: Problems with the wiring or connections to the gas valve can disrupt its operation, leading to the fault code.
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. Attempting to fix it yourself may not only be unsafe but could also void any warranties.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for the F27 fault code, primarily involving the replacement of the gas valve, is around £350. This includes parts and labour, as gas valves can be expensive and require professional installation.