Washer stoped flashing code f21 - Kenmore Elite 45986 Front Load Washer

You have something stuck in the pump or a bad pump,remove the bottom cover,look at the pump and you'll see that the center has a grove in it so you can grab it and turn it counterclockwise to remove it but first with a shop vac vac out all the water in the tub then set up the vac down near the pump,turn the center of the pump until water start to leak out,vac it up until it's drained and then remove the center piece,clean it out,also stick your finger into the pump and feelaround to make sure nothing is in there or in the impellar,check the rubber boot of the hose,you can stick the vac in there to see if anything gets vacced out,put the piece back in tightly,add some water,put it on drain,if it drains you're done,if it doesn't check the pump again,if it's clear you need a new pump,those pumps are hard to kill so most likely your gonna find some lovely stuff in there,also the water stinks from the detergent so get ready for the stink,it's always like that.hope this helps,if your washer doesn't have the pump that the center part can be removed just pull off the hoses and clean out the pump and check the hoses for any junk cought up in there.good luck with your washer