I was getting a F21 code off and on for some time. I checked to see if the screen was filled with lent or coins or a sock maybe. It was clean so I looked up online on what to do.
I finally ordered a new drain pump and motor assembly from appliancepartpro. It took maybe 15 minutes to install. I could have done it quicker but I had hand surgery and I did not want to rip out the stitches. After installation washer worked like a new one. Thanks to everyone for all your help.