Drain problem My Whirlpool Duet washer won't drain water completely. Some water remains in the drain hose. Is it normal?

If there's water in the drain line this is normal. There is roughly about a half a gallon of residual water that remains under the wash basket, drain line and drain pump combined. That's why it is important to leave the washer door open when not in use to allow the tub to air out. It will not evaporate the water, but will help reduce the build up of mold, mildew, and odors.

Now, if you look inside the wash tub and see standing water, then you may have some drain line issues. Make sure your drain line does not exceed 10 feet in length. Excessive lengths can cause backwash. Also, make sure the standpipe at the wall is at least two inches in diameter, a minimum of 34 inches from the floor and does not exceed a height of 72 inches. All these conditions can cause slow drain problems and/or backwash.

I hope this answers your question and that you find this helpful. Please post back if you need further assistance.

PS Make sure the standpipe is draining properly. It should be capable of draining approximately 17 gallons per minute.