What does the Baxi 600 Series E220 fault code mean?
The E220 fault code on the Baxi 600 Series indicates a problem with the domestic hot water (DHW) sensor. This fault typically suggests that the sensor is either faulty or not communicating properly with the boiler’s control system.
Common Causes
- Faulty DHW Sensor: The sensor may have failed due to wear and tear or manufacturing defects, leading to incorrect temperature readings.
- Wiring Issues: Damaged or loose wiring connections between the DHW sensor and the boiler’s control board can disrupt communication, 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 expertise. Attempting to fix it yourself could pose safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing the DHW sensor on a Baxi 600 Series boiler is around £150 to £200. This includes the cost of the part and labour, reflecting the complexity of the repair and the need for a qualified technician.