What does the Baxi 600 Series E490 fault code mean?
The E490 fault code indicates a domestic hot water (DHW) communication error within the Baxi 600 Series boiler. This typically suggests a problem with the communication between the boiler’s control board and the DHW sensor or related components.
Common Causes
- Faulty DHW Sensor: A malfunctioning sensor can disrupt the communication needed for hot water operation.
- Wiring Issues: Damaged or loose wiring connections between the control board and the DHW components can lead to communication errors.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for any gas or electrical issues, as these can be dangerous. However, you can check for loose wiring connections and ensure that the DHW sensor is properly connected.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for fixing the E490 fault code is around £150 to £250, primarily due to the potential need for a new DHW sensor or repairs to wiring, which can be labour-intensive.