Core issue: Error code F21 on Kenmore Elite front loading washer.
Resolution: F21=Long Drain
If the drain time exceeds 8 minutes the water valve turns off.
After 4 minutes the "Sd" error will be displayed, then 4 minutes later the F21 error code will be displayed.
Press STOP two times to clear the display.
Check the drain hose and make sure it is not plugged or kinked.
Unplug washer or disconnect power.
Check the electrical connections at the pump and make sure the pump is running.
Check the drain pump filter for foreign objects.
Plug in washer or reconnect power.
If above does not correct the problem the pump may need to be replaced.
: General information for resolution to this problem, is based on information
provided in question. Contact certified technician if problem persist.