E18
Splitvolt
Insulation Resistance / Isolation Fault
Splitvolt EV charger displays E18 and charging is disabled; may occur in damp or outdoor installations.
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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 inside charger enclosure, Water ingress into cable or handle, Degraded insulation on internal wiring, Contaminated PCB surfaces causing leakage
How to Fix / Troubleshooting
Safety first: Isolation faults can lead to shock hazards. Turn off power immediately and do not use the charger until resolved.
- Inspect installation location: Ensure the Splitvolt charger is mounted vertically and in accordance with its NEMA rating. Avoid direct water spray or pooling.
- Check for visible moisture: Look for condensation on the housing, cable entry points, and around the connector. If present, allow the unit to dry thoroughly and improve weather protection.
- Examine cable jacket: Inspect the entire cable for cuts or cracks that could allow water ingress. Replace the cable assembly if damaged.
- Do not open sealed enclosure: Opening the case can compromise isolation and weather sealing. Internal insulation testing should be done by a qualified technician.
- Persistent E18: Requires professional megger/insulation testing and likely replacement of the charger or cable.
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Repair Difficulty
Professional Required
5/5
Required Part
Internal Wiring Insulation
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