Maytag Abnormal Noise – High-Voltage or Mechanical Fault

Microwave runs but makes loud humming, buzzing, or grinding noises, especially when heating.

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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, Shorted high-voltage diode or capacitor, Worn turntable motor, Loose fan blade or blower wheel

How to Fix / Troubleshooting

Safety first: Unplug the microwave. Distinguish between internal high-voltage noise and mechanical noises from the turntable or fan.

Simple checks:

  • Remove the glass tray and roller ring, then run the microwave briefly with a cup of water. If the noise disappears, the turntable roller ring or tray may be the cause; clean and inspect them.
  • Check that the turntable support and coupler are seated properly.

Mechanical fan noise:

  • If the noise seems to come from the top or rear, the cooling fan motor or blower wheel may be loose or worn.

High-voltage noise:

  • Loud humming or crackling only when heating often indicates a failing magnetron or high-voltage component. This requires professional service.
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Repair Difficulty

Hard 4/5

Required Part

Turntable Motor
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