The Microwave Door Interlock Switch is an OEM part for Whirlpool microwaves. This safety device ensures that the microwave only operates when the door is securely closed. The interlock switch prevents the microwave from running with the door open, protecting users from exposure to microwave energy. You should replace the door interlock switch if it becomes faulty or damaged. Causes of a bad switch can include wear and tear from frequent use, electrical malfunctions, or physical damage from slamming the microwave door. Symptoms of a bad microwave door interlock switch include: Microwave not starting or running intermittently Microwave running with the door open Error messages or safety warnings The interior light not turning on or off properly This OEM part is also compatible with Maytag, KitchenAid, Jenn-Air, Amana, Magic Chef, Admiral, Norge, Roper, and Kenmore models.W10269458 (AP4429884) replaces W10211973, 1550016, 4393598, 8206347, AH2361111, EA2361111, PS2361111.