What does the Baxi 600 Series E690 fault code mean?
The E690 fault code on the Baxi 600 Series indicates a problem with the domestic hot water (DHW) chamber temperature, suggesting that the temperature is either too high or too low for safe operation. This fault can prevent the boiler from providing hot water effectively.
Common Causes
- Faulty DHW Sensor: A malfunctioning temperature sensor may not accurately read the water temperature, leading to incorrect readings and triggering the fault code.
- Blocked Heat Exchanger: A blockage in the heat exchanger can restrict water flow, causing temperature discrepancies and resulting in the E690 fault.
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 expertise. Attempting to fix it yourself could pose safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the E690 fault could be around £150 to £250, primarily due to the potential need for replacing the DHW sensor or cleaning the heat exchanger, both of which require professional service.