How to Fix / Troubleshooting

Safety first: Turn off power before opening the unit. Do not touch internal components while energized.

Characterize the noise: A single click at start/stop is normal. Continuous loud buzzing or rapid clicking is not.
Check mounting: With power off, open the Wallbox and ensure the contactor and any transformers/inductors are firmly mounted. Tighten mounting screws.
Inspect contactor: Look for signs of wear or pitting on the contactor. If the coil is noisy and the contacts are worn, replace the contactor.
Verify supply voltage: Have an electrician measure mains voltage. If significantly above nominal, consult the utility; high voltage can increase noise.

Mild humming can be normal, but sudden changes in noise level or pattern warrant professional inspection.

Wallbox EV charger makes unusual buzzing, humming, or clicking noises during operation.

Possible Causes