What does the Glow-worm Easicom E400 fault code mean?
The E400 fault code indicates a short circuit in the central heating (CH) sensor of the Glow-worm Easicom boiler. This issue can prevent the boiler from properly regulating the temperature of the heating system.
Common Causes
- Wiring Issues: Damaged or frayed wiring connected to the CH sensor can lead to a short circuit.
- Faulty Sensor: The CH sensor itself may be defective, causing incorrect readings and triggering the fault code.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to diagnose and repair the issue, as dealing with gas and electrical components can be hazardous. Attempting to fix it yourself may void warranties or lead to further complications.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the E400 fault code is around £150 to £250. This includes the cost of replacing the CH sensor and any necessary wiring repairs, reflecting the typical labour and parts costs in the UK.