The error code F21 is similar to F02 which both pertains to a draining problem. The usual cause is a blocked drain filter or a clogged/kinked. But since those areas are found to be not the source of the problem, the problem must be somewhere else. It is either the drain pump is broken particularly the impeller if the pump just hums/whirs or the pressure switch contacts are stuck/welded together and is, therefore, not tripping. The link below provides the detailed troubleshooting instructions the problem of this kind after the drain filter has been cleaned out.
Error Code F02/F21 on Whirlpool Duet and Kenmore Elite Front Load Washers (Filter Cleaned)
Hello & Welcome to FixYa
F21 error is displayed when the washer is unable
to drain, press PAUSE/CANCEL button twice to clear the display. After this
please check the drain hose and drain pump filter for any blockages and make
sure it is not clogged with foreign particles. You can also check the drain
pump to verify that its working. Please get back to me if you have any other
questions.
Kevin
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