The Microwave Door Switch is an OEM replacement part for Whirlpool microwaves. It is important for safety as it detects when the door is properly closed and latched before initiating cooking cycles. The switch prevents operation if the door is ajar. Causes of a bad door switch can include wear and grime accumulation over many years of use, impact damage, or failures in the plastic actuator or electrical components. Symptoms of a bad door switch include: The microwave failing to start cooking even with the door closed and latched Error messages related to the door position being displayed Inability to lock or properly sense the closed door position This genuine Whirlpool OEM replacement part is also compatible with Maytag, KitchenAid, Jenn-Air, Amana, Magic Chef, Admiral, Norge, Roper, and Kenmore models.W10269460 (AP4429920) replaces 1550018, AH2361113, EA2361113, PS2361113.