Garo Excessive Contactor or Transformer Noise

Charger makes a loud humming or buzzing noise 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

Aging or loose main contactor, Vibrating transformer or choke in power supply, Loose mounting screws on DIN rail components

How to Fix / Troubleshooting

Safety first: Noise may indicate overheating or mechanical wear. Isolate power before opening.

  • Identify source: With the cover removed (technician only) and power ON, carefully listen to locate the noisy component (contactor, transformer, choke). Keep clear of live parts.
  • Tighten mounting: With power OFF, tighten screws securing the contactor and any transformers or chokes to the backplate or DIN rail.
  • Check for overheating: Look for discoloration or smell of burnt insulation. If present, replace the noisy component.
  • Replace contactor: If the contactor buzzes loudly whenever energized, replace it with the correct Garo‑specified model.
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Repair Difficulty

Medium 3/5

Required Part

Main Power Contactor or Auxiliary Transformer
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