Karen Smith F/02 error code potential causes
Check the drain hose and make sure it is not plugged or kinked
Check the electrical connections at the pump and make sure the pump is running.
Check the drain pump filter for foreign objects
If the above does not correct the problem replace the pump
I would start by taking the lower front panel off. There are two bolts, one on each side of the panel, remove those. Once you have the panel removed, you will see a white plastic unit, that is your pump assembly. You should also see a round plug with a plastic tab across the front. That is your coin trap. Open the cap by twisting it counterclockwise and remove it. It may just be clogged.
If you have checked all those things and they are okay, you want to go ahead and remove the pressure tube connector from back of tub (remove the back cover to get access to it) A clogged pressure tube will solicit the pressure switch to stay in a position as if there is was still water in tub to be drained. It will do so even if empty. Clean out the tube and see if that works.
You can download the service manual from the bottom of this page