What does the Baxi 600 Series E990 fault code mean?
The E990 fault code on the Baxi 600 Series indicates a problem with the domestic hot water (DHW) pressure switch. This fault typically suggests that the pressure switch is either not detecting the correct water pressure or is malfunctioning.
Common Causes
- Blocked Pressure Switch: Debris or scale buildup can obstruct the pressure switch, preventing it from functioning correctly.
- Faulty Pressure Switch: The pressure switch itself may be defective or worn out, leading to incorrect readings.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as working with gas appliances can be dangerous. Attempting to fix gas or electrical components without proper training can pose serious risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing a faulty pressure switch on a Baxi 600 Series boiler is approximately £150 to £200. This includes the cost of the part and labour, reflecting the complexity of the repair and the need for a qualified technician.