What does the Baxi Megaflo E490 fault code mean?
The E490 fault code on a Baxi Megaflo indicates a fault within the domestic hot water (DHW) system. This typically suggests issues with the temperature sensor or the DHW heat exchanger.
Common Causes
- Temperature Sensor Failure: A malfunctioning temperature sensor can lead to incorrect readings, causing the system to shut down.
- DHW Heat Exchanger Blockage: A blockage in the heat exchanger can prevent proper water flow, leading to insufficient heating and triggering the fault code.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves gas and electrical components that require professional handling for safety reasons.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the E490 fault could be around £150 to £250, primarily depending on whether the temperature sensor or heat exchanger needs replacement, along with labour costs.