Microwave produces visible sparks or arcing inside the cavity during cooking.

Safety: Stop the microwave immediately by pressing STOP/CANCEL and unplug it.

• Remove metal: Ensure there is no metal cookware, twist ties, or foil touching the cavity walls.
• Clean cavity: Once cool, clean the interior thoroughly with a mild detergent solution, paying special attention to the area near the waveguide cover (usually a small mica or plastic panel on the side wall).
• Inspect waveguide cover: If it is burnt, cracked, or has holes, it must be replaced before further use.
• Touch-up paint: If enamel is chipped exposing bare metal, use only microwave-safe cavity touch-up paint as recommended by the manufacturer, or have a technician replace the cavity or panel if damage is extensive.