E20
Mennekes
Output Overcurrent / Short-Circuit Protection Trip
E20 displayed; charger indicates overcurrent or short-circuit event.
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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
Shorted output wiring inside charger, Internal contactor failure, Fault in vehicle drawing excessive current, Incorrect breaker rating or wiring
How to Fix / Troubleshooting
Safety first: Do not repeatedly reset breakers without identifying the cause. Risk of fire or equipment damage.
- Inspect internal wiring: With power OFF, check all high-current conductors from the input terminal block through the contactor to the socket or tethered cable. Look for crushed insulation, loose strands, or contact with chassis.
- Check contactor: Examine the contactor for signs of internal short (burn marks, melted housing). Replace if damaged.
- Test with another EV: If safe and wiring appears intact, test with a different vehicle. If only one vehicle causes E20, the issue may be in that vehicle’s onboard charger.
- Verify protective devices: Ensure that upstream breakers and fuses are correctly rated and coordinated with the Mennekes charger specifications.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Power Contactor / Output Wiring Harness
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