Is there a filter on Samsung washer model WF337AAL/XAA

SOURCE: I have a whirlpool front load washing machine model WFW8300SW00

Hay Crab.
what I have found is that the washer thinks it is not pumping out .. if your drain pump is clearly removing the all the water in a good time... then the problem is your pressure switch...it is telling the computer that it still has water in the machine...

replace the pressure switch and it will solve your f21 error.

It is a round unit on the right hand side on top...with a tube and wires going to it...let me know if it helps

SOURCE: UL Code

Solved the unbalanced problem - open the top of the machine (press in with a flat putty knife about 3" in on the front on each side while lifting up as there are 2- 1" wide catches). Once both sides are unlatched, raise the lid then slightly lift the rear of the lid so that it fits into the curved part at the top of the hinges then open all the way - tape the lid to the top so it doesn't flap about and scotch the lid to keep it from falling back down on you. Now, look around - see all that rust?  The rust has fallen into and gotten underneath one or more of the 4 white plastic suspension "ball joints" which have probably totally dried out by now from their factory grease because of the water, bleach, and rust particles.  Having someone help you, simply lift up on one of the 4 corner suspension rods - gravity and weight is all that holds them down. The white ball will lift out of the socket and still be attached to the rod. Clean out the rust, lightly sand the "socket" with emery cloth, then slop in a fingerful of grease. I used automotive wheel bearing grease with graphite in it. Also scrub off all embedded rust on the white plastic ball. Lower that corner back into the newly cleaned and greased socket and repeat for the other 3 corners. Now when you move the tub around notice how the balls pivot in their sockets like they are supposed to. When they were dry and rusty they wouldn't move enough to allow the tub to twist like it should so it slammed around.  Now, shake your head in disgust that after only 2 years there is so much rust that you wonder if it will make it another year before falling apart, close the lid, and try another load.  That totally solved my off-balance problem where even a single handkerchief would give the UL error. It is still a finicky machine, but at least once again works like it did when new.

SOURCE: Samsung WF317 Front Load Washer code nd

Check the drain pump itself. But at the same time if your clothes are still sudsy it sounds like it is not going through all the cycles. Almost like it is skipping a cycle

SOURCE: My Samsung WF218ANW/XAA front load washer will not

lefever352, I am currently trying to solve this same issue on the identical model. I removed , cleaned, and re-assembled all the water tubes and the entire pump assembly. The pump works but for some reason it is not priming into the drain tube. The pump assembly appears to have a diaphram over the outlet opening and it it looks like this might be the problem. I am still hunting the solution, BUT so far the above actions have to resolve our issue. I hope perhaps Fixya can help.

SOURCE: I have a samsung wf203anw

Posting a problem with your POS Samsung washer here is a waste of time! UII currently have the same problem a lot are having with this not draining nd code and I AM NOT going to pay for a tech to tell me that I have to have a guy come in to take my washer apart. I will do it myself!