Microwave causes arcing (sparks) inside the cavity during cooking.

Safety: Stop the microwave immediately if you see sparks. Unplug the unit and allow it to cool.

• Remove metal: Ensure no metal utensils, foil, twist ties, or metal-trimmed dishes are inside.
• Inspect waveguide cover: Check the waveguide cover for burns, holes, or heavy grease. Replace if damaged.
• Clean cavity: Thoroughly clean food splatters and grease, especially near the waveguide and rack supports.
• Touch-up paint: If enamel is chipped and bare metal is exposed, use microwave-safe cavity touch-up paint to cover small areas, following manufacturer instructions.
• Test with water: After repairs, test by heating a cup of water. If arcing persists, discontinue use and have a technician inspect the magnetron and cavity.