Hager Nuisance RCD Tripping on Inrush / Leakage

Charger frequently trips the upstream RCD/RCBO when starting a charge, but no specific charger error code is shown.

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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 multiple circuits exceeding RCD rating, Type A RCD used where Type B or EV‑specific is required, High inrush current from charger power supply, Minor insulation degradation in cable or charger

How to Fix / Troubleshooting

Safety first: Repeated RCD tripping indicates a potential safety issue. Do not bypass or replace with a higher‑rated device without proper assessment.

Steps to try:

  • Isolate other loads: Temporarily switch off other circuits on the same RCD to see if tripping stops when only the charger is active.
  • Check RCD type (electrician only): Ensure the upstream device is of the correct type and rating as specified by Hager (often Type A with RDC‑DD or Type B).
  • Insulation testing: A qualified electrician should perform insulation resistance tests on the charger circuit and cable.
  • Upgrade protection if needed: If total leakage is high due to multiple loads, consider a dedicated RCD/RCBO for the charger as per regulations.
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Repair Difficulty

Hard 4/5

Required Part

Upstream RCD/RCBO (Hager Protection Device)
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