How to Check the Drain Hose
The drain hose and recirculation hoses can be responsible for leaks. The drain hose can cause the dishwasher to fail to drain properly. The recirculation hose can be responsible for problems with poor rinsing of dishes.
To access the drain hose remove the lower panel located beneath the door. The panel is usually held in place with two screws either above or below the panel. It may be necessary to first open the door to the dishwasher to reach the screws over the panel, then close the door to remove the panel.
The drain hose connects to the pump and runs to the sink drain (or to the air gap on top of the sink). The pump has a second hose that recirculates the water back into the dishwasher. The drain hose is roughly 1 1/2 inches in diameter. While inspecting the drain hose, check the recirculation hose as well.
If checking for leaks, feel the hoses where they connect to the pump, for wetness and check the ground right under the connections. If they are wet, it may be a loose or improperly mounted clamp, a damaged pump housing or a leak in the hose itself.
If checking for blockages, disconnect the drain hose from the pump, pinch the wire clamp with pliers and slide it up the hose. Place a shallow pan beneath the pump to catch any spillage. Remove the hose from the pump; wiggling the hose may help to loosen it.
Check the hose and nipple to the pump for any debris. The only way to be certain the drain hose is completely clear is to disconnect it from the sink and run water through (such as spraying a garden hose through it at full pressure). Disconnect the recirculation hose and check it in the same way.
Reconnect the hoses and replace the clamps. Replace the lower panel and restore electricity to the dishwasher.