Remove both hoses from the DRAIN MOTOR/PUMP ASSY.
Inspect the hoses for obstruction (such as---a coin or large button).
NOTE: I usually place a dry towel over the *drain outlet* hose (the hose that goes from the washer-to-the-drain) and poke a hole in the towel---then I blow air through the drain hose. If the water in the hose clears/drains out---the hose is likely not obstructed with debris/foreign object(s).
Inspect the IMPELLER (looks like an airplane propeller) on the DRAIN MOTOR for debris preventing/obstructing the IMPELLER from spinning (such as a small nail). Examine the IMPELLER *blades* (4 blades) for damage. If 2 or more of the *blades* are missing/broken---water will not drain sufficiently (or at all). In some cases---the IMPELLER appears normal---but has actually become separated from the DRAIN MOTOR shaft and is not spinning when the motor is energized during the DRAIN CYLE.
If no obstruction is found and the DRAIN MOTOR runs/hums but water still does *not* drain out of the tub---order a new DRAIN MOTOR/PUMP ASSY (DC31-00054A) from www.repairclinic.com.
Drain pump part link ==> http://www.repaircli...100054A/1534541
Source: Samsung Washer WF206BNW/XAA