Leviton Excessive Contactor or Transformer Hum

Charger emits a loud humming or buzzing noise from the enclosure during operation.

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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 mounting of power contactor, Vibrating transformer or inductor on power board, Overvoltage causing magnetostriction noise, Worn contactor coil

How to Fix / Troubleshooting

Safety first: Noise often indicates vibration of energized components. Turn OFF power before opening the unit.

Steps:

  • 1. Localize the sound: With the cover on, listen to determine if the noise is from the top, bottom, or side of the EVSE.
  • 2. Inspect mounting (qualified person): With power OFF and cover removed, check that the contactor and any transformers are firmly mounted and that mounting screws are tight.
  • 3. Check for resonance: Ensure the enclosure is not loose on the wall, which can amplify normal hum.
  • 4. Replace noisy component: If the contactor or transformer itself is excessively loud, replace it with the correct Leviton part.
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Repair Difficulty

Medium 3/5

Required Part

Leviton EVSE Power Contactor
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