E03
Hyundai
Overcurrent / Relay Weld Detection
Display shows E03 and charging stops immediately after starting.
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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
Stuck or welded main contactor/relay, Short circuit in output wiring to vehicle connector, Faulty current sensor on power board, Incorrect current limit configuration on main control board
How to Fix / Troubleshooting
Safety first: Turn off power at the dedicated EV charger breaker. Do not attempt to open the relay compartment while energized.
- Check settings: If your Hyundai charger has a configuration app or DIP switches, verify the maximum current setting matches the circuit rating (e.g., 32 A on a 40 A breaker is incorrect).
- Inspect output cable: Look for burn marks, melted insulation, or kinks near the wallbox strain relief and along the cable.
- Listen for relay click: With the cover on and power restored, start a charge session and listen for a distinct click from the internal contactor. If no click or a loud buzzing is heard, the relay may be stuck or failing.
- Power down and open (if allowed): With power OFF, remove the cover and visually inspect the main contactor/relay for discoloration or melted plastic.
- If relay appears damaged or E03 persists: The main contactor and possibly the current sensor on the power board should be replaced by a qualified technician. Do not attempt to free a welded relay manually.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Contactor / Relay Module
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