Dishwasher won't drain. About 1 inch of water sits in bottom after completion of wash cycle.

Since the drain pump will pump the water out using the "cancel/drain" button, if it did not work then your problem is likely to be in the drain hose system or the garbage disposal downstream from the drain pump. Check for kinks in clogs in the drain hose. Grease can build up in the portion of the drain hose just before it attaches to the garbage disposal.

If you are having problems getting the water to drain out of your dishwasher then there are a few things that you need to check out.

First check the drain hose that it has not gotten pinched anywhere. Then check it to see if it may be plugged with dirt and debris. If you have it hooked to a garbage disposal make sure that the hole into the garbage disposal is open.

If all of that checks out, then check the screen inside at the bottom of the dishwasher. Excessive food buildup will block the flow of the water into the pump.

If that is clear then you may need to remove the bottom rack, and the bottom spray arm. This will allow access into the pump. Some dishwashers have a diverter flap that opens to allow the water into the bottom impeller, which is the pump out impeller. Also check that the bottom impeller is in good shape and not deformed. The switch that operates the diverter flap can also go bad. You need to check that it can operate and that is does if power is applied to it.

By checking all of these things you should be able to find your problem. You may have to take the time to eliminate the problems one by one till you get to the cause of your problem.

Check the below link for an detailed description

http://www.fixya.com/support/r4078724-dishwasher_problems_water_will_not_drain

COURTESY:heatman101 -A senior Expert in fixya..