Microwave emits sparks or arcing inside the cavity during cooking.

Immediate action: Press STOP/CANCEL and unplug the microwave as soon as you see sparks.

• Remove metal: Take out any metal utensils, foil, twist ties, or dishes with metallic trim.
• Clean cavity: Thoroughly clean the interior with warm soapy water, focusing on areas with heavy splatter or burn marks. Dry completely.
• Inspect waveguide cover: Locate the small plastic or mica panel on the side or top wall. If it is burnt, cracked, or has holes, replace it with an Ambiano-compatible waveguide cover.
• Touch-up paint: If the cavity paint is chipped down to bare metal, use microwave-safe cavity touch-up paint to cover exposed metal after cleaning and drying.
• Test with water: After repairs, test the microwave with a cup of water only and observe for any further arcing.