Commercial Chef Component Failure with Internal Arcing

Microwave produces a loud popping sound and stops heating, sometimes accompanied by a burnt smell.

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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

High-voltage capacitor failure, high-voltage diode shorting, internal arcing at magnetron antenna, burned waveguide cover

How to Fix / Troubleshooting

Immediate safety: Press STOP/CLEAR, unplug the microwave, and do not attempt to restart it.

Visual inspection (advanced):

  • Remove the cabinet and inspect the high-voltage capacitor, diode, and magnetron for visible damage or burn marks.
  • Check the waveguide cover inside the cavity for burn-through.

Because this involves high-voltage components, further testing and replacement should be performed only by a qualified technician. In many cases, replacement of the microwave is more economical.

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Repair Difficulty

Professional Required 5/5

Required Part

High-Voltage Capacitor
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