Dorothy B Franklinville , NJ September 03, 2014 Appliance: Model WHIRLPOOL DUET Continued to show f11 error code but knew it was the control unit as door lock was replaced Changed the control unit..as you can see it took me a while as I discovered if I tapped the old control unit the door would lock and machine would work. I got tired of doing that so I finally replaced the unit. Works great!!! 8 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes