Dishwasher fills up with water when not in ...

The drain hose under the sink need to be tied up,above the point where it enters the drain pipe or disposal,water is feeding back into the unit from the kitchen sink or disposal.

HI. this will occur if the inlet valve assembly is faulty or stuck slightly open. i recommend testing this valve just to confirm this failure. the test procedure is as follows.

The water inlet valve can be identified by the water hoses connected to it. One hose will lead from the valve to the pump/motor assembly in the center of the dishwasher. There are two wires (four, if it has two solenoids) connected to the water inlet valve. Label the wires and connections so that you can properly reconnect them later. The wires are connected with slip on connectors. Firmly pull the connectors off of the terminals (do not pull on the wire itself). You may need to use a pair of needle-nose pliers to remove the connectors. Inspect the connectors and the terminals for corrosion. If either is corroded they should be cleaned or replaced.

Use a continuity tester or multimeter to test for continuity. Set the multimeter to the ohms setting X1. Touch one probe to each terminal. A reading of infinity indicates a bad solenoid that must be replaced. Different brands and models will have various measurements, but the valve should show some resistance if it is functioning properly. If your valve has two solenoids, test the second one in the same way as the first.

If the solenoid is working properly, but water leaks through the valve even when the dishwasher is off, then the valve itself is the problem. Debris may be preventing the valve from closing. If the valve cannot be cleaned, it will have to be replaced. The valve can also fail mechanically. So even if it passes the electrical test, it may still require replacement. If you have ruled out all other possibilities, go ahead and replace the valve.