Answer Jeff, the door switch would need to be tested for continuity. If it does not have continuity when the door is open, it has failed. If there is continuity, the socket would need to be tested for voltage when the door is opened. If there is not voltage, the main control has failed. If there is, the bulb or socket has failed. Read More... Answered by AppliancePartsPros.com | Saturday, September 30, 2023