What does the Glow-worm Energy F71 fault code mean?
The F71 fault code indicates a problem with the domestic hot water (DHW) return temperature, suggesting that the return water temperature is outside the expected range. This can lead to inefficient heating and potential system damage if not addressed promptly.
Common Causes
- Blocked Heat Exchanger: A blockage in the heat exchanger can restrict water flow, causing incorrect temperature readings.
- Faulty Temperature Sensor: A malfunctioning temperature sensor may provide inaccurate readings, triggering the F71 fault code.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to diagnose and repair the issue, especially if it involves gas or electrical components. Attempting to fix these issues without proper training can be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F71 fault could be around £150 to £250, depending on whether the issue is a blocked heat exchanger or a faulty sensor. This includes parts and labour, reflecting the complexity of the repair.