What does the Glow-worm Easicom E390 fault code mean?
The E390 fault code on the Glow-worm Easicom indicates a short circuit in the domestic hot water (DHW) sensor. This issue can prevent the boiler from properly regulating water temperature, leading to potential heating problems.
Common Causes
- Wiring Issues: Damaged or frayed wires connecting the DHW sensor can cause a short circuit.
- Faulty DHW Sensor: A malfunctioning sensor itself may produce incorrect readings, triggering the fault code.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves electrical components and potential safety risks. Attempting to fix it yourself could lead to further damage or safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for the E390 fault code is around £150 to £200, which includes the replacement of the DHW sensor and associated labour. This cost reflects the specific part and the expertise required for safe installation.