Had sporadic f21 code approx every 3 4 washes.
F21 error code kenmore washer.
Hope this post saves someone some time money.
No hose kinks or anything wrong with the drain lines.
Make sure that it is installed properly per the instructions in your owner s manual.
An improperly installed drain hose can prevent the washer from draining properly.
I finally took the drain lines all off from the drain pump up to the plastic elbow near the top where it exited the washer as well as the next line from that same elbow to.
Check the tub for excessive suds.
The f21 code on many kenmore elite front load washers indicates a long drain problem.
Followed the troubleshooting guide above.
This can be caused by excessive suds or a restriction in the drain system.
Detailed instructions on how to fix the error code f21 in the kenmore washer.
I was so sick of my washer i always got the f20 and f22 message.
Check for excessive suds in the washer tub.
Check the drain hose for kinks and clogs.
Oh man this is a great fix.
The causes of the error tips on how to fix the breakage of the washer.
Found lint debris in the filter.
I had the same problem still getting f21 sud codes even after changing the pressure switch and the drain pump.