What does the Baxi 600 Series E870 fault code mean?
The E870 fault code on the Baxi 600 Series indicates a problem with the domestic hot water (DHW) flue gas temperature. This fault suggests that the temperature of the flue gases is outside the acceptable range, which can affect the boiler’s efficiency and safety.
Common Causes
- Blocked Flue: A blockage in the flue system can prevent proper venting of gases, leading to abnormal temperature readings.
- Faulty Temperature Sensor: A malfunctioning temperature sensor may provide incorrect readings, triggering the fault code.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer for this issue, as it involves gas and electrical components that require professional handling. Attempting to fix it yourself could pose safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the E870 fault could be around £150 to £300, depending on whether the issue is a blocked flue or requires replacement of the temperature sensor. Costs may vary based on labour and parts needed.