What does the Baxi Megaflo E590 fault code mean?
The E590 fault code on a Baxi Megaflo indicates a problem with the domestic hot water (DHW) system temperature. This typically suggests that the temperature of the water is either too high or too low, which can affect the performance of the heating system.
Common Causes
- Faulty Temperature Sensor: A malfunctioning temperature sensor may provide incorrect readings, leading to the E590 fault code.
- Blocked Heat Exchanger: A blockage in the heat exchanger can prevent proper heat transfer, causing temperature discrepancies in the DHW system.
Can I fix it myself? (DIY)
It is advisable to call a Gas Safe Engineer for this issue, as it involves gas and electrical components that require professional expertise. Attempting to fix it yourself could pose safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the E590 fault could be around £150 to £250, primarily depending on whether the temperature sensor needs replacement or if the heat exchanger requires servicing.