What does the Baxi Megaflo E340 fault code mean?
The E340 fault code on a Baxi Megaflo indicates a fault with the central heating (CH) heat exchanger. This typically means there is an issue affecting the heat transfer process, which can lead to inadequate heating performance.
Common Causes
- Blocked Heat Exchanger: Debris or sludge buildup can obstruct the flow of water, reducing efficiency and causing overheating.
- Faulty Temperature Sensor: A malfunctioning sensor may incorrectly report temperatures, leading to improper operation of the heat exchanger.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for any repairs related to 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 addressing the E340 fault could be around £250 to £400, depending on whether the heat exchanger needs cleaning or replacement. This cost reflects the complexity of the repair and the need for professional expertise.