How to Fix / Troubleshooting

Immediate action: Stop the microwave at once and unplug it. Do not continue to operate while arcing or smoke is present.

Step-by-step checks:

1. Remove metal objects: Ensure no metal utensils, foil, or twist ties are inside.
2. Clean the cavity: Thoroughly clean all walls, ceiling, and floor with mild detergent to remove grease and burnt food. Pay special attention to corners and around the waveguide cover.
3. Inspect the waveguide cover: The small mica or plastic panel (usually on the side wall) must be intact. If it is burned, cracked, or has holes, replace it before using the microwave again.
4. Check cavity coating: If paint is chipped down to bare metal, especially near the waveguide, have the cavity professionally repaired or consider replacing the microwave.

Warning: Do not operate the microwave without a proper waveguide cover installed.

Microwave emits a burning smell, smoke, or visible sparks (arcing) inside the cavity during use.

Possible Causes