What does the Baxi 600 Series E640 fault code mean?
The E640 fault code on the Baxi 600 Series indicates a domestic hot water (DHW) electrical fault. This typically suggests an issue with the electrical components responsible for heating water, which may affect the boiler’s ability to provide hot water.
Common Causes
- Faulty DHW Sensor: A malfunctioning sensor can lead to incorrect temperature readings, triggering the fault code.
- Electrical Connection Issues: Loose or damaged wiring connections can disrupt the electrical flow necessary for the DHW system to operate correctly.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer for any electrical issues related to the boiler. Attempting to fix electrical faults without proper training can be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the E640 fault could be around £150 to £250, primarily depending on whether the DHW sensor needs replacement or if wiring repairs are necessary.