I had the same problem. My Whirlpool Duet wouldn’t spin. After a lot of research and worrying it came to mind that maybe my washer wouldn’t spin because I had only one sweatshit in there, which forced it out of balance. After spending a lot of time trying to figure out how to fix it I decided to try a full load of towels. All cycles worked, including the spin cycle. I quickly cancelled the parts I ordered online to fix what turned out to be a simple problem. Don’t try to wash one heavy item. Your washer will be out of balance and the sensors will not allow it to spin.