E08
Ravenheat
Mains Supply / Polarity / Earth Fault
Furnace shows E08 and will not operate, often after a power surge or wiring disturbance.
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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.
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Possible Causes
Incorrect live/neutral polarity, Missing earth connection, Supply voltage out of range, Internal PCB power supply fault
How to Fix / Troubleshooting
Safety: Electrical work must comply with local regulations. If you are not competent, contact an electrician or heating engineer.
User checks:
- Ensure the fused spur is switched on and the fuse is intact.
- Check that no extension leads or multi-plug adapters are used to power the furnace.
- Power-cycle the unit and see if E08 clears.
Technician checks:
- Verify correct polarity (L/N) and earth continuity at the appliance terminals.
- Measure supply voltage and ensure it is within Ravenheat specifications.
- Inspect the main PCB for visible damage, burn marks, or swollen capacitors.
- Test surge protection devices and replace the PCB if the internal power supply is faulty.
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Repair Difficulty
Hard
4/5
Required Part
Main Control PCB
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