What does the Vaillant ecoFIT pure F46 fault code mean?
The F46 fault code on the Vaillant ecoFIT pure indicates a problem with the system pressure sensor, which is responsible for monitoring the pressure within the heating system. This fault can prevent the boiler from operating correctly, leading to heating or hot water issues.
Common Causes
- Faulty Pressure Sensor: The pressure sensor itself may be defective or damaged, leading to incorrect readings.
- Wiring Issues: Damaged or loose wiring connections to the pressure sensor can cause communication failures, resulting in the F46 error code.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as working with gas appliances can be dangerous. Attempting to fix electrical or gas-related problems without proper training can lead to safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F46 fault code is around £150 to £250. This includes the cost of a new pressure sensor and labour charges for a qualified engineer to diagnose and replace the faulty component.