Enel X Abnormal Mechanical Noise from Contactor or Transformer

Charger makes loud clicking, buzzing, or humming noises during operation, more than a brief contactor click.

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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

Worn or vibrating main contactor, Loose mounting hardware, Failing internal transformer or inductor, AC supply issues causing chatter

How to Fix / Troubleshooting

Safety: Persistent buzzing can indicate arcing. Turn OFF power if noise is accompanied by smell or visible arcing.

  • Step 1 – Identify source: With the cover on and charger running, listen to locate the general area of the noise (top, bottom, left, right).
  • Step 2 – Internal inspection: With power OFF and cover removed, check that the main contactor and any transformers/inductors are firmly mounted and that mounting screws are tight.
  • Step 3 – Check for damage: Look for burn marks or melted plastic around the noisy component.
  • Step 4 – Replace noisy parts: Replace a chattering or buzzing main contactor or power module as needed.
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Repair Difficulty

Medium 3/5

Required Part

Main Output Contactor
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