BMW Internal Component Overheating / Insulation Breakdown

BMW EV charger emits a persistent burnt or electrical smell even when not charging

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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

Overheated terminal block due to loose connection, Failing transformer or power module, Carbonized PCB around high-power components, Previous surge damage

How to Fix / Troubleshooting

Safety first: Immediately turn off the breaker and do not use the Wallbox. A persistent burnt smell indicates a serious fault.

  • External check: Without opening the unit, sniff near the top and bottom vents to confirm the smell originates from the Wallbox.
  • Do not reset repeatedly: Avoid repeatedly turning the unit on if the smell returns; this can worsen damage.

An internal inspection by a BMW-authorized technician is required. They will open the unit, identify the overheated component (e.g., terminal block, power module, PCB), and replace the damaged parts or the entire Wallbox.

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Repair Difficulty

Professional Required 5/5

Required Part

BMW Wallbox Power Module and Terminal Block
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