Ohme Short Circuit or Earth Leakage Under Load

Ohme charger trips the upstream MCB/RCBO or RCD as soon as charging starts.

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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

Damaged internal wiring, Faulty RCD/RCM module, Water ingress causing leakage, Vehicle with internal earth leakage fault

How to Fix / Troubleshooting

Critical safety: Repeated tripping indicates a fault. Do not keep resetting the breaker without investigation.

  • 1. Note which device trips: Identify whether the MCB, RCBO, or a separate RCD is tripping. This helps distinguish between overcurrent and earth leakage.
  • 2. Try another vehicle: If safe, test with a different EV. If tripping only occurs with one vehicle, that vehicle likely has a fault.
  • 3. Visual inspection: Check the charger and cable for visible damage or signs of water ingress.
  • 4. Do not bypass protection: Never replace an RCBO with a plain MCB or increase breaker rating to stop tripping.
  • 5. Electrician/technician testing: A professional should perform insulation resistance tests on the charger circuit, inspect internal wiring, and test the internal RCD/RCM module. Faulty components must be replaced.
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Repair Difficulty

Professional Required 5/5

Required Part

Internal RCD / Residual Current Monitoring Module
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