I have been getting the Sd code and then F21 code during regular wash. I followed directions cleaning out white filter on bottom of machine and it did not help. So I followed directions for resetting the pressure pump and it worked when I set the machine to rinse/spin. Now I tried to do a regular wash and got th Sd and then F21 codes. So it's still not working. Any suggestions? Maybe I need a new pressure switch?

SOURCE: whirlpool washing machine won't spin after rinse cycle

there is a coupling between the motor and transmission that has cracked. with the crack in the coupling the transmission cant spin as fast as the motor causeing the loud noise. replace coupling to solve problem

SOURCE: Whirlpool 6th sense awm8163 programes never stops now cannot get it to work at all

The pump is at the lower left of the front of the machine covered by a white plate. Use a bowl to catch any remaining water when opening the screw thread inside and then clean and replace. If it is truely beyond repair then a new filter pump can be bought from ebay for £3 or thereabouts.

I have just drained mine manually in this way and am going to run it empty with soda crystals to glean a few more days use whilst the new pump arrives.

Good luck :)

SOURCE: SD error code won't go away

Manual says -

"Sd" (Suds Detected)
Did you use regular detergent?
Regular or hand-washing detergents are not recommended
for this washer. Use only High Efficiency ("HE") detergent.
Did you add too much detergent?
Always measure detergent. Follow detergent manufacturer's
directions.
If excessive suds are detected, the washer will display this
code while running a suds reduction correction routine at the
end of the wash cycle. The suds reduction routine removes
extra suds and assures proper rinsing of your garments. If the
code remains and the wash cycle dial is flashing after the
recovery routine has stopped, re-select your desired cycle
using cold water. Press START. Do not add detergent.

Let me know if this helps, or you would like more information/help.

SOURCE: Problem with F21 code on whirlpool duet sport

i had the same problem. take the bottom cover off of the front of the washer. on the right you will see a round white screw off cover, it is very tight, it unscrews counter clock-wise. pull this out and see if there is any debris in it. if you look into the hole on the right side there is a hole about 1 inch round, this is the pump opening. you may have to take the gray drain hose off of the back of the pump housing and feel if anything is stuck in there, in my case there was a penny stuck side ways blocking the flow of water. after i took it out the washer has been running great again. this is obviously a design flaw, that something that large could manage to get that far, lucky for me it didn't damage the pump impeller. hope this helps. this should take care of the SD and the F21 error codes.

SOURCE: Washing machine displays an LF error code.

LF = Long Fill

LF flashes when the water level does not change for a period of time after the valves are turned on OR water has disengaged the basket but control does not detect a water level change.
Is water supply connected and turned on?
Are hose screens plugged?
Is water entering the tub? If so check pressure hose connection to machine/motor control.


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