If your freezer light isn’t working, it could be similar to fixing a refrigerator light. Make sure your appliance hasn’t been unplugged and the outlet is working. Frost buildup can also cause a door switch to not function properly. Use a warm, damp cloth to melt any frost that may be hindering the door switch.
You may also have a faulty door switch or the freezer door needs to be properly aligned. Or it could simply be that the door has been left open and the light automatically turned off after a period of time.