What does the Baxi 600 Series E330 fault code mean?
The E330 fault code indicates a lockout in the domestic hot water (DHW) system of the Baxi 600 Series boiler. This typically occurs when the boiler is unable to heat water due to a fault in the system.
Common Causes
- Blocked DHW Heat Exchanger: A blockage can prevent water from circulating properly, leading to a lockout.
- Faulty DHW Sensor: If the sensor that monitors the water temperature is malfunctioning, it may incorrectly signal a fault.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for any issues related to gas or electrical components. Attempting to fix these without proper training can be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the E330 fault could be around £150 to £250, depending on whether the issue is a blocked heat exchanger or a faulty sensor, which may require replacement.