E04
Hyundai
Input Overvoltage / Undervoltage Protection
Charger shows E04 and will not start; sometimes occurs during storms or grid fluctuations.
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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 outside Hyundai charger operating range, Loose line or neutral connection in supply terminal block, Incorrect wiring (single‑phase vs three‑phase), Faulty input voltage sensing circuit on main control board
How to Fix / Troubleshooting
Safety first: Switch off the charger breaker. Only open the wiring compartment if you are qualified to work on mains voltage.
- Verify supply voltage: Using a multimeter, measure line‑to‑neutral and line‑to‑line voltages at the charger input. Compare with the specifications in the Hyundai charger manual.
- Check terminal block: With power OFF, tighten all line, neutral, and earth screws on the charger’s input terminal block. Look for discoloration or melted insulation indicating overheating.
- Confirm wiring configuration: Ensure the charger is wired according to the installation diagram (e.g., correct phase connections for 3‑phase models).
- Power cycle: Restore power and see if E04 clears after 1–2 minutes of stable voltage.
- If voltage is normal and E04 persists: The input sensing circuit on the main control board may be defective. Contact a service technician to test and replace the board.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board (Input Voltage Sense Circuit)
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