MUSTART
Noisy Relay or Magnetic Component Vibration
Charger makes a loud buzzing or humming noise during charging, louder than usual relay click or fan noise.
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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 power relay, loose mounting of internal transformer or choke, resonance from mounting surface, partial relay coil failure
How to Fix / Troubleshooting
Safety warning: Unusual noises can indicate impending failure. If the noise is accompanied by smell of burning or heat, stop using the charger.
- Check mounting: Ensure the MUSTART charger is firmly mounted to a solid surface. Loose mounting can amplify normal hum.
- Listen for pattern: A brief click at start and stop is normal; continuous loud buzzing is not.
- Monitor temperature: During operation, periodically feel the charger housing. It should be warm but not excessively hot.
- Service if persistent: Continuous loud buzzing suggests a failing relay or magnetic component inside the main control board, which should be replaced by a technician.
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Repair Difficulty
Medium
3/5
Required Part
Main Control Board (Power Relay / Inductor)
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