RCA Mechanical or High-Voltage Noise

Microwave makes loud buzzing, humming, or grinding 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

Failing magnetron, Loose or vibrating cooling fan, Worn turntable motor, High-voltage transformer vibration

How to Fix / Troubleshooting

Safety Warning: Unplug the microwave before any internal inspection. Loud buzzing from the high-voltage section can indicate dangerous faults.

Checks:

  • 1. Isolate source: Listen carefully to determine if the noise is from the bottom (turntable), back (transformer), or top/rear (fan).
  • 2. Test without turntable: Remove the glass tray and support ring, then run briefly. If the noise stops, the issue is with the tray, ring, or coupler.
  • 3. Inspect fan: If the noise is from the top or rear, a loose or obstructed fan blade may be the cause. Clean and tighten as needed (intermediate DIY).

If the noise is a deep, loud buzz accompanied by poor heating, the magnetron or transformer may be failing and should be replaced by a professional.

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Repair Difficulty

Hard 4/5

Required Part

Cooling Fan Motor
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