How to Test an ASKO Dishwasher Level Switch

A level switch, which is also known as a pressure switch, keeps your Asko dishwasher from overflowing, but if it’s not working your dishwasher may under- or overfill.

Float Assembly

The kickpanel is the panel found underneath the dishwasher door.The kickpanel is the panel found underneath the dishwasher door.
You can find the level switch mounted next to the sump assembly. However, before you test your level switch, you should check the float assembly.

The function of the float is to trigger the level switch so it turns off the flow of water to the dishwasher when it reaches the desired level. If the float becomes stuck, it can’t move freely and can keep your dishwasher from filling or draining properly. Before you begin working, unplug your dishwasher. To locate the float assembly, remove the lower dishrack and look on the bottom of the dishwasher’s tub. Test the float by lifting it several times and letting it drop. Remove the float and look for obstructions. Clean any debris you find and replace the float assembly. If you find no debris, or if you dishwasher still isn’t working properly after you clean the float assembly, you’ll need to test the level switch.

Level Switch

To locate the level switch, remove the kickplate panel found below the dishwasher door. The level switch will be on the right side of the sump assembly. It will have several wires and one small rubber hose connected to it. Label the wires so you can reconnect them properly later. To remove the wires, pull firmly on the slip-on connectors. Do not pull directly on the wires.

Testing

Use a multimeter to test the level switch for continuity. Set your multimeter to the lowest setting for ohms of resistance and test each of the three possible pairs of terminals by touching one of the probes on the meter to a switch terminal while you touch the other probe to a different terminal. Press down on the switch’s button. Note the reading, then move one of the probes to the other terminal and press the switch’s button again. Repeat with the final pair of terminals. The readings you receive should be either zero or infinity if the switch is good. If you don’t see a change in the reading, you have a bad switch.

Other Problems

If the level switch is working properly, or you’re still having problems after replacing it, you should inspect the water inlet valve and the drain valve and solenoid. Dirty filter screens on the water valve can keep your dishwasher from filling up as can an improperly functioning drain valve. Use a multimeter to test these parts.

About the Author

Lani Thompson began writing in 1987 as a journalist for the "Pequawket Valley News." In 1993 she became managing editor of the "Independent Observer" in East Stoneham, Maine. Thompson also developed and produced the "Clan Thompson Celiac Pocketguides" for people with celiac disease. She attended the University of New Hampshire.