What does the Glow-worm Easicom E490 fault code mean?
The E490 fault code indicates that there is an open circuit in the flue gas pressure switch, which is responsible for monitoring the pressure of the flue gases. This can prevent the boiler from operating safely and efficiently, leading to a shutdown.
Common Causes
- Blocked Flue: A blockage in the flue system can prevent proper airflow, causing the pressure switch to open.
- Faulty Pressure Switch: The pressure switch itself may be defective or malfunctioning, leading to incorrect readings.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to diagnose and repair this issue, as it involves gas and electrical components that can be dangerous if handled improperly.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for this fault is around £150 to £250, depending on whether the flue is blocked or the pressure switch needs replacing. This includes the cost of parts and labour for a qualified engineer.