E025
EVBox
Insulation Monitoring Fault
Charger shows E025; app indicates insulation resistance error; charging disabled.
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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
Low insulation resistance between live conductors and earth, Moisture ingress in cable or connector, Damaged insulation on internal wiring, Faulty insulation monitoring device (IMD)
How to Fix / Troubleshooting
Critical safety: Low insulation resistance can lead to electric shock. Do not use the charger until the cause is identified and corrected.
- Visual inspection: Check the cable, connector, and charger housing for visible damage, cracks, or signs of water ingress.
- Drying: If the unit or connector has been exposed to heavy rain or washing, allow it to dry thoroughly before retesting.
- Insulation test (electrician only): Perform an insulation resistance test between live conductors and earth according to EVBox guidelines. Identify and replace any cable or component with low insulation.
- Check IMD connections: With power off, ensure the insulation monitoring device is correctly wired and its signal cable to the main board is secure.
- Replace IMD: If insulation is confirmed good but E025 persists, replace the insulation monitoring device or main board.
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Repair Difficulty
Professional Required
5/5
Required Part
EVBox Insulation Monitoring Device
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