How to Test a Dishwasher Drain Valve

by DoItYourself Staff

Testing a dishwasher drain valve will help troubleshoot an improperly working dishwasher. While not all dishwashers have them, if the dishwasher is not draining properly, it is worthwhile to check the drain valve before replacing the entire dishwasher. You will need the following tools:

Phillips or Flathead screwdriver
Needle nose pliers
Multitester

Step 1 - Remove the Access Panel

Disconnect the machine from its power supply or turn off the breaker. Remove the access panel. This is usually secured with two screws on the front of the machine under the door. You may have to open the door to access them. Once removed, examine the motor of the machine. If there are two or three wires, your machine does not have a drain valve and you can stop here. If it has four wires, it does have the drain valve on the machine, and you can proceed.

Step 2 - Locate and Disconnect the Drain Valve

Locate the valve by locating the water hose coming from the motor. The hose will come to the valve, which consists of a gate arm (which should move easily) and a solenoid or coil. Note how the wires are attached to the coil, and remove them with the pliers.