Wallbox charger emits a burning smell or visible smoke during or shortly after starting a charge.
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.
Possible Causes
How to Fix / Troubleshooting
Safety first: Immediately stop charging, turn off the upstream breaker, and if necessary unplug the vehicle. Do not re‑energize the charger until it has been inspected.
- Ventilate area: Open windows or doors to clear any smoke. Do not inhale fumes.
- External inspection: After cooling, inspect the outside of the Wallbox and cable for burn marks or melted plastic.
- Internal inspection (technician): With power off, open the unit and locate the source of the burning smell or discoloration. Common areas are the input terminal block, contactor, and main board.
- Replace damaged parts: Any charred or melted components (terminals, contactor, cable gland, PCB) must be replaced. Also correct the underlying cause (e.g., loose screw, undersized wire).
- Full safety test: After repair, a technician should perform insulation resistance and functional tests before returning the charger to service.
Do not ignore burning smells; continued use can lead to fire or complete failure.
Repair Difficulty
Required Part
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