What does the Baxi 600 Series E660 fault code mean?
The E660 fault code indicates a domestic hot water (DHW) communication error in 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, leading to the E660 error.
- Wiring Issues: Damaged or loose wiring connections between the control board and the DHW components can cause communication failures.
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 to ensure safety and compliance with regulations.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the E660 fault could be around £150 to £250, primarily depending on whether the DHW sensor needs replacement or if wiring repairs are required.