What does the Baxi 600 Series E820 fault code mean?
The E820 fault code on the Baxi 600 Series indicates a problem with the domestic hot water (DHW) pressure switch. This fault typically arises when the pressure switch fails to detect the correct water pressure, preventing the boiler from operating efficiently.
Common Causes
- Blocked Pressure Switch: Debris or scale buildup can obstruct the pressure switch, leading to incorrect readings.
- Faulty Pressure Switch: The pressure switch itself may be malfunctioning or damaged, requiring replacement.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to diagnose and repair this issue, as working with gas appliances can be dangerous. Attempting to fix the pressure switch without proper training may lead to further complications.
Estimated Repair Cost (2026 UK Prices)
The estimated cost for repairing the E820 fault, including parts and labour, is approximately £150-£200. This estimate accounts for the replacement of the pressure switch and the technician’s service fee.