Microwave sparks or arcs inside the cavity during cooking.

Safety Warning: Stop the microwave immediately if you see sparks. Unplug before cleaning or inspection.

Steps:

• 1. Remove metal: Ensure there is no metal cookware, twist ties, or foil in the oven.
• 2. Inspect waveguide cover: Locate the small plastic or mica panel on the side wall. If it is burned, cracked, or has holes, it must be replaced before further use.
• 3. Clean cavity: Thoroughly clean grease and food splatter from the walls and ceiling using a mild detergent. Avoid abrasive pads that can remove paint.
• 4. Touch-up paint: If small paint chips expose bare metal, use microwave-safe cavity touch-up paint to cover them.

Do not operate the microwave with a damaged waveguide cover or exposed metal, as this can damage the magnetron.