E020
ABB Self-Test Failure / Internal Diagnostics Error

Charger shows E020 and refuses to start; often after a failed self-test at power-up.

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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

Failed internal relay test, RCD self-test failure, Faulty self-test circuitry on control board, Internal wiring error between modules

How to Fix / Troubleshooting

Note: ABB chargers perform self-tests on safety components at startup.

  • Power cycle: Turn off the breaker for 2–3 minutes, then restore power and observe the startup sequence. Listen for relay clicks and watch for repeated E020.
  • Check event log: If accessible via app or web, review the diagnostic log to see which self-test failed (e.g., RCD, relay).
  • Inspect internal connections (technician): Verify that all internal harnesses between the control board, RCD module, and power module are properly seated.
  • Component testing: A technician should test the RCD module and main contactor operation individually using ABB test procedures.
  • Replace failed module: Replace the RCD module, main contactor, or control board depending on which component fails the self-test.
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Repair Difficulty

Professional Required 5/5

Required Part

RCD Module / Main Contactor / Control Board
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