E20
GoCable
Startup Self‑Test / Internal Diagnostics Failure
Charger shows E20; display may read "Self‑Test Failed"; unit will not start charging.
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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, Faulty RCD self‑test circuit, Defective internal power supply, General control board failure
How to Fix / Troubleshooting
Safety warning: Do not bypass self‑test protections; they ensure safe operation.
- Power cycle: Turn off the breaker for at least 2 minutes, then restore power and observe if E20 reappears.
- Listen for relay clicks: During startup, you should hear relays or contactors operate. No sound may indicate a failed relay or control board.
- Inspect for visible damage: With power OFF, open the unit and look for burnt components, bulging capacitors, or loose connectors.
- Check low‑voltage power supply: Verify that the control board is receiving the correct low‑voltage DC from the auxiliary power supply module.
- Component replacement: If a specific module (e.g., RCD, auxiliary PSU) is identified as failed, replace that module. Otherwise, replace the main control board.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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