What does the Vaillant ecoFIT pure F45 fault code mean?
The F45 fault code indicates a malfunction with the cold water sensor in the Vaillant ecoFIT pure boiler. This issue can prevent the boiler from operating efficiently, leading to potential heating problems.
Common Causes
- Faulty Cold Water Sensor: The sensor may be defective or damaged, causing inaccurate readings.
- Wiring Issues: Damaged or loose wiring connections to the sensor can disrupt its functionality.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves electrical components and could pose safety risks if not handled correctly.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing the cold water sensor is around £150 to £200. This includes the cost of the part and labour, as sensor replacement typically requires professional expertise.