Sparking During Broiling or Grilling Cycles - Over-the-Range Microwave

Is an accessory rack or pan installed?

Metal oven-proof bakeware should only be used during Oven functions such as air fry, toast, bake, convect bake, roast, broil, and dehydrate cycles (on some models). Using the provided accessory racks with microwave function can cause arcing or sparking. 

Tips

• When cooking oily or juicy foods, place an oven-proof baking plate on the oven's bottom to catch dripping oil or juice.
• There are 3 levels (depending on the model) to place the accessories; placing the appropriate accessories onto the right level will help you to achieve the best results.

Is it Normal? 

This is normal and occurs as fat burns off from past cooking. Sparking will stop once the fat is completely burned off.