Volkswagen Noisy Contactor or Coil Vibration

VW wallbox makes loud buzzing, humming, or clicking noises during charging beyond a brief initial relay click.

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

Worn or loose main contactor in VW wallbox, Coil not receiving stable voltage, Mechanical mounting loosened, Excessive mains voltage fluctuation

Safety first: Unusual mechanical noise can indicate impending failure. If noise is accompanied by smell or heat, switch off immediately.

Compare at different loads: Reduce charging current in the app and see if noise decreases.
Check mounting: Ensure the VW wallbox is firmly mounted to the wall and not resonating against loose panels.
Listen duration: A single click at start and end is normal; continuous buzzing is not.

Persistent loud buzzing usually means the main contactor should be inspected and likely replaced by a technician.

Hard 4/5

VW wallbox main contactor

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