Microwave sparks inside the cavity during cooking, with arcing sounds or bright flashes.

Safety: Stop the microwave immediately if you see sparks. Unplug it before inspection.

• 1. Remove metal objects: Ensure no metal utensils, foil, or twist ties are inside.
• 2. Inspect the waveguide cover: Locate the small rectangular cover (usually on the side wall). If it is burnt, cracked, or has holes, it must be replaced.
• 3. Clean the cavity: Thoroughly clean all walls and the ceiling with mild detergent and water to remove grease and burnt food. Dry completely.
• 4. Touch-up paint: If the enamel is chipped, exposing bare metal, use microwave-safe cavity touch-up paint to cover the area.
• 5. Replace the waveguide cover: Install a new mica waveguide cover designed for your OK model.
• 6. Test with a cup of water: Run a short cycle and observe. If arcing persists, further inspection of the waveguide and magnetron by a technician is required.