Our Whirlpool Duet had been intermittently coding F21 and not draining. A couple of times my husband had to extract the water out with the shop vac. Finally it stopped draining at all and it was making a funny noise. After reading about F21 and others stories we figured out that it most likely needed a new drain pump. We ordered the part through AppliancePros. It arrived quickly, as promised, we followed the installation video on line and it really wAs quick and easy to install. (In all fairness my husband is a Mechanic), but I think I could have done it. The video was a great help. Started up the Washer and it worked just great! So much better to buy and install the part, than pay 8x more for a new one!