AMPROAD Acoustic Noise from Contactor or Magnetic Components

Charger makes loud buzzing, humming, or clicking noises 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 main contactor, Vibrating output inductor or transformer, AC line harmonics causing coil buzz, Worn contactor causing chatter

How to Fix / Troubleshooting

Safety: Noisy components may still be safe, but noise can indicate impending failure. Turn OFF power before opening the unit.

  • 1. Identify source:
    • Listen carefully to locate whether the noise comes from the top, bottom, or side of the charger.
  • 2. Inspect mounting:
    • With power OFF, open the charger and check that the main contactor, inductor, and transformer are securely fastened.
    • Tighten mounting screws as needed.
  • 3. Check for contactor chatter:
    • If the contactor rapidly clicks on and off, there may be a control issue or weak coil voltage.
    • Inspect the control board and contactor coil connections.
  • 4. Replace noisy components:
    • If the contactor is excessively loud or chattering, replace the AMPROAD power board or contactor assembly.
  • 5. Verify operation: After repair, run a charge session and confirm that noise is within normal levels.
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Repair Difficulty

Medium 3/5

Required Part

AMPROAD Main Contactor / Output Inductor
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