A defective float switch in your Whirlpool dishwasher will affect the filling and draining of your dishwasher. Once you know how to replace a float switch on a Whirlpool dishwasher, you can repair it yourself and save money. Float switches are available at appliance repair stores. Take the model number of your dishwasher so that the store can get you the correct part.
Disconnect the power supply to the Whirlpool dishwasher by turning off the circuit breaker to the unit inside the home electrical panel.
Remove the two screws that secure the access panel and toe panel to the bottom of the dishwasher using a Phillips head screwdriver. Pull the access and toe panels away from the dishwasher and out of your work area.
Locate the two wires that connect to the float switch. To find the float switch, locate the float inside your dishwasher. The float switch is found below the dishwasher directly under the float. Label each wire so that the correct wire goes on the proper terminal when installing the new float switch. Pull each wire from the float switch terminals using needle nose pliers.
Remove the two screws that secure the float switch with a Phillips head screwdriver. Use a flathead screwdriver to remove the retaining clip that secures the switch to the float assembly. Slide the float switch off the float assembly and out of the dishwasher.
Slide the new float switch onto the float assembly under the dishwasher. Slide the retaining clip over the float switch and float assembly. Line up the float switch into position, and secure it with the retaining screws.
Connect the two wires to the float switch making sure the correct wire is attached to the proper terminal. Position the access panel and toe panel back into place, and secure them with the two retaining screws.
Turn the circuit breaker back on to the dishwasher.
Always turn power off to appliances before attempting repairs to them.