What does the Glow-worm Easicom E840 fault code mean?
The E840 fault code indicates that the flue gas pressure is stuck, which can prevent the boiler from operating efficiently or safely. This issue typically arises from blockages or faults in the flue system that affect the proper venting of exhaust gases.
Common Causes
- Blocked Flue: A blockage in the flue pipe can restrict the flow of flue gases, causing the pressure to become stuck.
- Faulty Pressure Sensor: A malfunctioning pressure sensor may incorrectly read the flue gas pressure, leading to the E840 fault code being triggered.
Can I fix it myself? (DIY)
It is highly recommended to call a Gas Safe Engineer to diagnose and repair this issue, as it involves gas and safety components. Attempting to fix it yourself could pose serious risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the E840 fault could range from £150 to £300, depending on whether the issue is a simple flue blockage or requires replacement of the pressure sensor.