What does the Baxi 600 Series E940 fault code mean?
The E940 fault code on the Baxi 600 Series indicates a problem with the domestic hot water (DHW) gas valve. This issue typically prevents the boiler from supplying hot water effectively.
Common Causes
- Faulty Gas Valve: The gas valve may be malfunctioning or stuck, preventing proper gas flow to the burner.
- Electrical Connection Issues: Poor electrical connections or wiring faults can disrupt the signal to the gas valve, causing it to fail.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer for any issues related to the gas valve, as working with gas appliances can be dangerous. Attempting DIY repairs could lead to safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for a faulty gas valve on a Baxi 600 Series boiler is around £250 to £350. This includes the cost of the replacement part and labour, reflecting the complexity of the repair and the need for a qualified technician.