GoCable
Noisy Contactor or Coil Vibration
Charger makes loud buzzing or chattering noises when starting or during charging.
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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
Undervoltage on contactor coil, Worn contactor armature, Loose mounting hardware, AC ripple on DC coil supply from failing auxiliary PSU
How to Fix / Troubleshooting
Safety warning: Buzzing contactors may overheat. Do not ignore persistent loud noises.
- Identify source: Listen carefully to locate whether the noise comes from the main contactor, fan, or another component.
- Check coil voltage: A technician should measure the contactor coil voltage during operation to ensure it matches the rated value.
- Tighten mounting: With power OFF, tighten screws securing the contactor and any nearby metal panels that may resonate.
- Inspect auxiliary PSU: If coil voltage is unstable, test or replace the auxiliary power supply module.
- Replace noisy contactor: If mechanical wear is evident or noise persists, replace the main power contactor.
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Repair Difficulty
Hard
4/5
Required Part
Main Power Contactor
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