KitchenAid
Arcing at Magnetron Antenna or Waveguide
Microwave fan and light run but there is a loud crackling or popping sound 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
Damaged magnetron antenna, burnt waveguide cover, heavy grease or carbon buildup near waveguide, loose waveguide screws
How to Fix / Troubleshooting
Safety: Stop the microwave immediately if you hear crackling or see sparks. Unplug the unit.
- Inspect waveguide cover: Remove and examine the cover for burn marks or holes. Replace if damaged.
- Clean area: Clean the cavity around the waveguide opening thoroughly.
- Magnetron inspection: If arcing persists with a new cover, the magnetron antenna may be damaged and the magnetron should be replaced by a professional.
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Repair Difficulty
Hard
4/5
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