E04
Walli
Input Overvoltage Protection Trip
Charger shows E04 and does not energize; often logged as 'Overvoltage' in the Walli app.
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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
Supply voltage above Walli rated maximum, Loose neutral causing floating phase voltage, Faulty Walli input voltage sensing circuit, Incorrect grid configuration (e.g., 3‑phase feed to single‑phase Walli model)
How to Fix / Troubleshooting
Safety first: Overvoltage can damage the charger and vehicle. Do not continue using the charger until the supply is verified.
Steps:
- Measure supply voltage: Have a qualified electrician measure line‑to‑neutral and line‑to‑earth voltages at the Walli input terminals with the unit powered off and cover removed. Compare with the rating on the Walli nameplate.
- Check neutral integrity: Confirm the neutral conductor is tight and continuous back to the distribution board. A broken neutral can cause high voltage on single‑phase loads.
- Verify configuration: Ensure the Walli model matches the supply (single‑phase vs three‑phase). Mis‑wiring a single‑phase Walli to a 3‑phase supply can trigger E04.
- Power cycle: After correcting any wiring or supply issues, turn the breaker off for 5 minutes, then back on and test.
- If E04 persists with correct voltage: The input voltage sensing circuit on the Walli main control board may be defective and the board should be replaced.
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Repair Difficulty
Professional Required
5/5
Required Part
Walli main control board
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