Boiler displays E08, no ignition attempt, often after a power surge or wiring issue.
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Possible Causes
How to Fix / Troubleshooting
Safety: Isolate the boiler before removing the front cover. Electrical testing must be done by a competent person.
User checks:
- Check the fused spur is switched on and the fuse is intact (typically 3A).
- Ensure no other high-load appliances are causing voltage dips on the same circuit.
Engineer checks:
- Measure mains voltage at the boiler terminals; confirm correct voltage and polarity.
- Inspect the mains terminal block for heat damage or loose screws; tighten and replace as needed.
- Check the boiler’s internal power supply outputs (e.g. 24V, 5V) on the EHC PCB.
- If internal voltages are missing or unstable, replace the main PCB with an EHC-approved board.
Do not bypass fuses or safety devices. If a surge is suspected, consider fitting surge protection to the supply.
Repair Difficulty
Required Part
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