What does the Vaillant ecoTEC plus F71 fault code mean?
The F71 fault code on the Vaillant ecoTEC plus indicates a communication error within the heating system. This typically suggests that the boiler is unable to receive or send data correctly, which can affect its operation.
Common Causes
- Faulty PCB: A malfunctioning printed circuit board can disrupt communication between components.
- Wiring Issues: Damaged or loose wiring connections can lead to communication failures within the system.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves electrical components and potential safety risks. Attempting to fix it yourself could lead to further damage or safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F71 fault could be around £200 to £300, primarily due to the potential need for a new PCB and the associated labour costs for a qualified engineer.