E14
J+ Booster
Insulation Resistance Too Low (Output to Ground)
Display shows E14; charger may start but then quickly stops with the same error.
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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 output cable or connector, Damaged insulation inside J+ Booster housing, Contamination on PCB causing leakage paths, Actual insulation fault in vehicle detected via charger test
How to Fix / Troubleshooting
Safety: Low insulation resistance can lead to electric shock. Do not continue using the charger until the cause is identified.
- Disconnect and dry: If the charger or cable has been exposed to rain or washing, allow it to dry thoroughly for at least 24–48 hours in a dry, ventilated area.
- Visual inspection: Check the entire length of the cable and connector for cuts, nicks, or crushed areas. Look for white residue or corrosion indicating water ingress.
- Test with another vehicle: If E14 only occurs with one vehicle, the vehicle’s insulation may be compromised and should be checked by a dealer.
- Do not open the housing: Internal insulation tests require specialized equipment. If E14 persists, the J+ Booster must be tested and repaired by a qualified technician.
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Repair Difficulty
Professional Required
5/5
Required Part
J+ Booster Output Cable Assembly
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