What does the Baxi 600 Series E340 fault code mean?
The E340 fault code indicates a problem with the domestic hot water (DHW) temperature sensor in the Baxi 600 Series boiler. This fault can prevent the boiler from accurately regulating the temperature of the hot water supply.
Common Causes
- Faulty Temperature Sensor: The sensor may be malfunctioning or damaged, leading to incorrect temperature readings.
- Wiring Issues: Damaged or loose wiring connections to the sensor can disrupt its functionality and cause the fault code to appear.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves electrical components and potential safety risks. Attempting to fix it yourself may void warranties or lead to further complications.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing the DHW temperature sensor is around £120, including parts and labour. This cost reflects the price of the sensor and the expertise required for safe installation.