"F20" is a No Water Detect error.It is an indication that you either have no water coming into the washer, or very little water at all. If the pressure switch has not tripped after 6 minutes, the error code is displayed.
http://www.fixya.com/support/r1491905-f20_error_code_whirlpool_duet_kenmore
http://www.appliancepartspros.com/
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