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

Safety: Immediately press Stop/Cancel and unplug the microwave if you see sparks or smoke. Do not continue to operate until the cause is identified.

• Remove metal objects: Ensure no metal utensils, twist ties, or foil are in the cavity unless specifically allowed by the manual.
• Inspect waveguide cover: Check the small mica or plastic cover on the side wall (waveguide cover). If it is burned, cracked, or has holes, replace it.
• Check cavity paint: Look for chipped or burned paint exposing bare metal. Touch up with microwave-safe cavity paint if minor; severe damage may require cavity repair or replacement.
• Remove residue: Clean any heavy grease or food splatter, especially near the waveguide cover and ceiling.

If arcing continues after cleaning and replacing the waveguide cover, discontinue use and have the unit inspected professionally.