Mercedes-Benz
Overheated Protective Earth Connection
Wallbox ground or earth wire shows signs of overheating or discoloration at the terminal.
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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
Loose PE terminal screw in Mercedes-Benz wallbox, Undersized earth conductor, Corrosion increasing resistance at PE terminal, Fault currents due to repeated faults
How to Fix / Troubleshooting
Safety warning: A compromised earth connection is dangerous. Do not use the charger until corrected.
- Inspect PE terminal: With power off, remove the PE conductor, clean the terminal and conductor end, and re-terminate securely.
- Check conductor size: Ensure the earth conductor size matches or exceeds the phase conductor size as per local regulations.
- Look for corrosion: Remove any corrosion and replace the conductor if strands are damaged.
- Test earth continuity: Have an electrician verify earth continuity and loop impedance after repair.
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Repair Difficulty
Medium
3/5
Required Part
PE Terminal / Earth Conductor
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