Wallbox Nuisance Tripping / Earth Leakage or Overcurrent

Wallbox charger trips the upstream RCD/RCBO or breaker 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

Combined leakage from EV and Wallbox exceeding RCD threshold, Incorrect type of RCD (e.g., Type AC instead of A or B), Short circuit in cable or connector, Miswired neutral/earth

How to Fix / Troubleshooting

Safety first: Do not repeatedly reset a tripping breaker or RCD without finding the cause. Risk of fire or electric shock.

  • Check RCD type: Verify that the upstream RCD/RCBO is of the type recommended by Wallbox (typically Type A or B for EV charging). Replace if incorrect.
  • Inspect cable and connector: Look for visible damage or moisture. Replace the cable assembly if compromised.
  • Test without vehicle: Turn on the breaker with the Wallbox powered but no vehicle connected. If it trips, the fault is in the Wallbox or wiring. If it only trips when the EV is connected, the vehicle may contribute to leakage.
  • Wiring check (electrician): Confirm that neutral and earth are correctly wired and not shared improperly with other circuits.

Persistent tripping requires professional diagnosis of both the Wallbox and the installation wiring.

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Repair Difficulty

Hard 4/5

Required Part

Charging Cable Assembly
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