Samsung
Cavity Arcing / Waveguide Contamination
Microwave interior is sparking or arcing during cooking, often near the waveguide cover or metal objects.
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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 in cavity, Damaged or burnt mica waveguide cover, Heavy grease or carbon buildup, Exposed metal on cavity wall
How to Fix / Troubleshooting
Immediate safety: Press Stop/Cancel and open the door. Unplug the microwave before inspection.
- Remove metal: Ensure no metal utensils, foil, twist ties, or dishes with metallic trim are inside.
- Inspect waveguide cover: Locate the small rectangular cover (often on the side wall). If it is burnt, cracked, or has holes, it must be replaced.
- Clean cavity: Remove grease and food splatters, especially near the waveguide cover, using a mild detergent. Dry thoroughly.
- Replace cover: Install a new Samsung-compatible mica waveguide cover. If arcing persists, have a technician inspect the waveguide and cavity for damage.
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Repair Difficulty
Medium
3/5
Required Part
Mica Waveguide Cover
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