Oven light is not working properly.
Replace or reinsert the light bulb if loose or defective. Use gloves or a small wash cloth when handling the light bulb because touching it with your fingers may deposit oils on it and thus cause it to burn out prematurely.
The bulb may have burned out. Buy a replacement bulb.
View our How-to-Videos on the Bosch YouTube Channel to learn how to change a light bulb in your oven.