How to Troubleshoot & Replace Whirlpool AP4009110 / 12002121 Infinite Switch (Surface Burner Control)

R $ R cooktop disassemble unit and install switch. 

My cooktop has an access panel, which permitted me to easily replace the dual switch. I recommend a person first acquaint themselves with their appliance before rushing in. I began the wrong way and added some unnecessary steps. However the job is done, and all's well. 

Replaced switch with new infinite switch kit purchased from Appliance Parts Pros. The correct part was shipped and recieved in 2 days. 

I found the switch that I needed on appliancepartspros.com. I ordered it at around 1700, or 5 pm. I checked the mail the very next morning, and it was in the mailbox. Never in my life have I ever received anything that I ordered online the next day. I got a 1/4" nut driver and took four screws out of the switch cover. I then took two screws from the top of the switch, disconnected the wires, and took the burnt switch out. I had the switch installed and the cooktop back together before my wife got up, mega brownie points. Excellent service and delivery faster than Jimmy John's! Haha.