Hello! Before using the top and bottom ovens for the first time, remove all the accessories, and then clean the ovens thoroughly. Then, set the lower oven to Bake, and run it at 400 °F for 1 hour. Next, set the microwave (top) oven to Power Convection, and then run it at 400 °F for 1 hour. There will be a distinctive odor. Ensure your kitchen is well ventilated during this conditioning period. Thank you for choosing Samsung! ^Lena