What does the Vaillant ecoFIT pure F48 fault code mean?
The F48 fault code indicates a problem with the flue gas temperature sensor in the Vaillant ecoFIT pure boiler. This sensor is crucial for monitoring the temperature of the exhaust gases, and a fault can lead to safety issues and inefficient operation.
Common Causes
- Faulty Sensor: The temperature sensor may be malfunctioning due to wear and tear or electrical issues.
- Wiring Issues: Damaged or loose wiring connections to the sensor can cause incorrect readings or failure.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer to diagnose and repair this issue, as it involves gas and electrical components that can be dangerous if handled improperly.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing the flue gas temperature sensor is around £150 to £200. This includes the cost of the part and labour, as the sensor itself is relatively inexpensive, but professional installation is necessary for safety.