Mini External Residual Current Device Nuisance Trip or Real Earth Leakage

Mini EV Home Charger trips the house RCD/RCBO as soon as charging starts; no specific charger error code

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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

Combined leakage from charger and other appliances exceeding RCD rating, DC leakage from EV interacting with upstream RCD, Incorrect type of RCD installed (not Type A or B as required), Internal insulation fault in charger

How to Fix / Troubleshooting

Danger: Repeated RCD trips indicate potential leakage. Do not bypass protection.

  • Isolate loads: Turn off or unplug other large appliances on the same RCD and retry charging. If trips stop, total leakage may have been too high.
  • Check RCD type (electrician): Verify that the upstream RCD/RCBO is of the type specified by Mini (often Type A or B). Replace with correct type if necessary.
  • Test with another EV (if possible): If trips only occur with one vehicle, the vehicle’s onboard charger may be leaking.
  • Insulation test (technician): A qualified technician should perform insulation resistance tests on the charger circuits to detect internal faults.

If the charger is found to be the source of leakage, internal components such as the power module or cable must be replaced.

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Repair Difficulty

Professional Required 5/5

Required Part

Mini EV Charger Power Module Assembly
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