Did you know that a defective microwave door switch could be the reason your microwave oven isn’t working or won’t heat? Most microwaves have three or four door switches that allow the appliance to start or heat once the door is fully closed. A faulty door switch may prevent the microwave from working properly even with the door closed. You should also be aware that a blown fuse in the microwave is often caused by a defective door switch. A multimeter can be used to test the switches for continuity – a continuous electrical path present in the switch. If a switch tests negative for continuity, it should be replaced. Repair Clinic stocks microwave oven door switches for all the major brands, including Electrolux, GE, Samsung, Kenmore, KitchenAid, and LG. To find the right door switch for your microwave, enter the full model number of the appliance in our website’s search bar, then select "Switch” from the part category followed by the appropriate part title. If you need some personal assistance in identifying the exact part you need, you’re always welcome to give our Customer Service Team a call at 1-800-269-2609.