Locate the pressure switch behind the removed control panel. It should have a circular plastic housing with a tube and separate wiring harness attached to it.
Hand remove the switch's wiring harness and attached tube.
Insert a small flat head screwdriver between the switch's attachment point and the washer's interior wall. Press the screwdriver down to release the switch's clip. Turn the device counterclockwise to remove it completely from the machine.
Set the switch down on top of the washer so that the wiring connector faces you with no obstructions from the rest of the device.
Set the multimeter to read continuity in ohms. Attach one multimeter probe to the middle switch contact and the other probe to the right side contact.
Observe the multimeter's reading. If it registers infinity, denoted by a blank reading or a display of the value one, the switch is bad. A reading of approximately 0 ohms indicates a good switch.
Place the probes onto the two outside contacts for another switch reading. Observe the multimeter. This reading should be infinity on the multimeter. An indication of 0 ohms means the switch has failed.
Reverse steps 2 through 8 to reassemble the washer, if the switch tests well.
Turn the washer on and run for a normal cycle to verify that the pressure switch works correctly