What does the Baxi Megaflo E390 fault code mean?
The E390 fault code on a Baxi Megaflo indicates a fault with the domestic hot water (DHW) temperature sensor. This issue can prevent the boiler from accurately measuring the water temperature, potentially affecting hot water delivery.
Common Causes
- Faulty Temperature Sensor: The sensor may be malfunctioning or damaged, leading to incorrect temperature readings.
- Wiring Issues: Damaged or loose wiring connections to the temperature 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 safety risks. Attempting to fix it yourself could void warranties or lead to further complications.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing the DHW temperature sensor is around £150 to £200. This includes the cost of the part and labour, reflecting the typical pricing for professional repairs in the UK.