Kenmore 4756 n21 error code

N 21? If this is in the twenties then a drain or water issue is present. Looks like a he4 model so try this hit drain/spin and on spin speed select no spin, finally press prewash quickly two or three times. A C:0 will appear and the machine will self test. The tech manual is behind the kick panel on the bottom secured with either a 1/4 or 9/32 hex screw, then look right at the side panel for a pouch for the paper.