What does the Glow-worm Easicom E770 fault code mean?
The E770 fault code indicates a flue gas pressure short circuit, which suggests that the boiler is detecting an issue with the flue gas pressure. This can prevent the boiler from operating safely and efficiently.
Common Causes
- Blocked Flue: A blockage in the flue system can restrict the flow of flue gases, leading to pressure issues.
- Faulty Pressure Sensor: A malfunctioning pressure sensor may incorrectly report flue gas pressure, triggering the fault code.
Can I fix it myself? (DIY)
It is strongly advised 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 resolving the E770 fault could range from £150 to £300, depending on whether a blockage is cleared or a faulty sensor is replaced. This cost reflects the complexity of the work and the need for professional expertise.