A GE Nautilus dishwasher may not drain if too much detergent is used, a kink is present in the drain hose or an object blocks the sump area in the rear of the dishwasher. It's normal for about 2 cups of water to remain at the bottom of the dishwasher.
Dishwashers generally drain to the kitchen sink drain or a garbage disposal. A clogged kitchen sink may prevent the dishwasher from draining. If a garbage disposal is present, turning it on is advised to clear food and debris from the drain system. For newly installed garbage disposals, it's best to make sure the plastic disposal drain plug has been removed, because this plug does not allow the dishwasher to drain. It's also good to ensure that the water at the bottom of the dishwasher is not backing up through the drain hose from the sink or another device.
A clogged air gap sometimes prevents dishwashers from draining properly. An air gap is a device required by certain plumbing codes and is usually found at the top of the sink. Most air gaps are easily cleaned by removing the cover, unscrewing the plastic cap, removing any debris and replacing the cap and cover.