Whirlpool Genuine OEM W10211974 Microwave Door Switch. The door switch monitors the door latch position and communicates to the electronic control board whether the latch is open or closed.
This part works with the following brands: Whirlpool, Roper, Admiral, Maytag, Hardwick, Jenn-Air, Estate, Magic Chef, Crosley, Inglis, Norge, Modern Maid, Amana, Kenmore, KitchenAid, Caloric, & IKEA.
 
Possible Repair Solution For:

Will not start, no heat.
 
Please Note: This is intended as a guideline only, as other items can cause the same symptoms.
 
This part is also known as a microswitch, micro switch, relay switch.