What does the Baxi 600 Series E850 fault code mean?
The E850 fault code on the Baxi 600 Series indicates a problem with the domestic hot water (DHW) temperature sensor. This fault suggests that the sensor is either malfunctioning or has failed, preventing the boiler from accurately regulating water temperature.
Common Causes
- Faulty Temperature Sensor: The sensor may be damaged or defective, leading to incorrect readings.
- Wiring Issues: Damaged or loose wiring connections to the temperature sensor can disrupt its function.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to diagnose and repair this issue, as it involves electrical components and safety risks. Attempting DIY repairs could lead to further complications or safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing the DHW temperature sensor on a Baxi 600 Series boiler is approximately £150 to £200. This includes the cost of the part and labour, reflecting the typical pricing for professional service in the UK.