Panasonic
Cavity Arcing
Microwave interior is sparking when cooking, especially near the side wall or waveguide cover.
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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, Damaged or contaminated waveguide cover, Exposed metal from chipped cavity paint
How to Fix / Troubleshooting
Safety Warning: Stop the microwave immediately if you see sparks and unplug it.
Steps:
- Remove metal: Ensure there is no metal cookware, foil, or twist ties inside.
- Clean thoroughly: Remove all food splatters and grease, especially near the waveguide cover.
- Inspect waveguide cover: If it is burnt, cracked, or has holes, do not use the microwave until it is replaced.
- Check cavity paint: Look for chipped paint exposing bare metal. Small chips can sometimes be repaired with microwave-safe cavity paint by a technician.
If arcing continues after cleaning and removing metal: Have the waveguide cover and cavity inspected and repaired by a professional.
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Repair Difficulty
Medium
3/5
Required Part
Waveguide Cover
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