What does the Glow-worm Easicom E640 fault code mean?
The E640 fault code indicates an open circuit in the flue gas pressure sensor, which means the boiler is unable to detect the pressure of the flue gases correctly. This can lead to safety concerns, as the boiler may not operate efficiently or safely without proper readings.
Common Causes
- Faulty Flue Gas Pressure Sensor: The sensor may be malfunctioning or damaged, leading to incorrect readings.
- Blocked Flue: A blockage in the flue system can prevent proper gas flow, causing the pressure to be outside of acceptable limits.
Can I fix it myself? (DIY)
It is highly recommended to call a Gas Safe Engineer for this issue, as it involves gas and electrical components that can be dangerous if handled improperly. Attempting to fix it yourself may void warranties and compromise safety.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the E640 fault could range from £150 to £300, depending on whether the flue gas pressure sensor needs replacement or if the flue system requires clearing. This cost reflects the complexity of the work and the need for a qualified engineer.