Washed a rug. Error code F21 came up when washer

"F21" is a Long Drain error code. This indicates that you have an obstruction in the drainage system. In most cases, this means you probably have a clog in the drain pump. The following link explains:

http://www.fixya.com/support/r1484065-f21_error_code_whirlpool_duet_kenmore

Rugs are notorious for losing fiber and holding loads of dirt. You may have something getting caught in the pump impeller and slowing it down. Included is a follow-on link that explains how to check the drain pump to clean. You may also have to remove the inlet hose that runs from the bottom of the wash tub to the inlet side of the drain pump. Debris can commonly clog in this area as well causing the drain cycle to fail.

If you have any questions about this repair, or need additional assistance, please let me know. I hope this helps you.

NOTE: If these preliminary measures do not correct your problem, you may have to replace the drain pump. It does not take much to damage the pump impeller or motor. Since the error code is generated if the drain cycle exceeds 8 minutes, if the pump is damaged and can't pump at the required volume, the error code will continue to appear until the pump is replaced.

NOTE: The "SUDS" error can also commonly occur with the F21 error code as this is usually generated when air is sensed in the drainage system.