E20
Hyundai
Undervoltage / Power Supply Error
Robot lawnmower displays E20 and does not move; may be accompanied by a low-voltage warning.
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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
Battery deeply discharged, Loose battery terminals, Faulty internal fuse or power relay, Short circuit in wiring harness
How to Fix / Troubleshooting
Safety first: Disconnect the mower from the charging station and turn off the main power before opening any covers.
- Check battery connector: Open the battery compartment and ensure the connector is fully seated and not burnt or melted.
- Charge fully: Place the mower on the base and allow an extended charge (overnight) to recover a deeply discharged battery.
- Inspect fuses: Some Hyundai models include an inline fuse or PCB-mounted fuse on the power input. Check for a blown fuse and replace with the same rating if necessary.
- Look for damaged wiring: Inspect the main power harness from the battery to the PCB for crushed or cut insulation that could cause a short.
- Replace battery or PCB: If voltage remains low despite charging, the battery or main control board may be defective and require replacement.
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Repair Difficulty
Hard
4/5
Required Part
Main Power Harness
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