What does the Baxi Megaflo E450 fault code mean?
The E450 fault code on a Baxi Megaflo indicates a problem with the domestic hot water (DHW) return temperature. This typically means that the return temperature is outside the expected range, which can affect the efficiency and performance of the heating system.
Common Causes
- Blocked Heat Exchanger: A blockage in the heat exchanger can prevent proper heat transfer, leading to incorrect return temperatures.
- Faulty Temperature Sensor: If the temperature sensor is malfunctioning, it may provide inaccurate readings, triggering the E450 fault code.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for any issues related to gas or electrical components. Attempting to fix these problems without proper training can be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the E450 fault could be around £150 to £250, primarily depending on whether the issue is a blocked heat exchanger or a faulty temperature sensor, both of which require professional assessment and potential replacement.