E10
BYD
Insulation Resistance Fault (DC Leakage / Isolation Error)
Charger shows E10 and stops charging; vehicle may indicate 'Charging interrupted – insulation fault'.
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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
Moisture ingress in BYD charger output section, Damaged insulation in output cable harness, Faulty insulation monitoring device (IMD) on power module, Contamination or tracking on internal busbars
How to Fix / Troubleshooting
Safety first: Insulation faults can lead to electric shock. Do not use the charger until inspected.
- Inspect for visible moisture: Check around the charger enclosure and cable entry points for signs of water leaks or condensation.
- Allow drying time: If the unit is in a damp location (garage, outdoor wall), turn off power and allow 24 hours of drying. Improve ventilation if possible.
- Check cable condition: Look for cracks, cuts, or crushed sections on the BYD cable. Replace if any damage is found.
- Try another vehicle: If E10 only occurs with one vehicle, the isolation fault may be in the vehicle’s onboard charger.
- Professional testing: A technician should perform insulation resistance tests on the charger output and inspect the IMD. Replace the power module or IMD if defective.
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Repair Difficulty
Professional Required
5/5
Required Part
Insulation Monitoring Device
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