Microwave produces sparks or arcing inside the cavity during cooking.

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

Steps:

• 1. Remove metal: Ensure there is no metal cookware, foil, twist ties, or utensils inside.
• 2. Inspect waveguide cover: Check the waveguide cover for burn marks or holes. Replace if damaged.
• 3. Check cavity paint: Look for chipped or burnt paint exposing bare metal, especially near corners. Touch up with microwave-safe cavity paint if minor.
• 4. Use proper cookware: Only use microwave-safe glass, ceramic, or labeled plastic containers.

Note: Persistent arcing after these steps may indicate deeper damage to the magnetron or waveguide and should be evaluated by a technician.