Emerson Cavity Arcing / Waveguide Damage

Microwave interior shows sparks or arcing during cooking.

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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

Metal object or foil in cavity, Chipped or missing cavity paint exposing metal, Burned or cracked waveguide cover, Food debris on waveguide cover

How to Fix / Troubleshooting

Immediate action: Stop the microwave at once and unplug it.

Check for metal:

  • Remove any metal utensils, twist ties, or foil from the cavity.

Inspect cavity and waveguide:

  • Examine the interior walls and ceiling for chipped paint exposing bare metal; touch-up with microwave-safe cavity paint if minor.
  • Inspect the mica waveguide cover for burns, cracks, or holes; replace if damaged.
  • Clean any food or grease from the waveguide cover area.

If arcing continues after these steps, internal waveguide or magnetron damage may exist and requires professional service.

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Repair Difficulty

Medium 3/5

Required Part

Waveguide Cover
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