Pull out the washing machine and inspect the drain hose. The end of the drain should be level with the top of the wash tub, about 38 inches above the ground. Cut the drain hose to the right length, using a utility knife.
Place the drain hose inside the drain so that it is loose and has air. A closed drain will cause suction.
Unplug the machine from the wall.
Slide a putty knife under each end of the control panel to unlock it then push it back toward the wall to expose the inside.
Find the plastic tube running from the water control switch, and inspect it for kinks. This tube fills as the water level inside the tub rises. If it is kinked, it will read the water level as full. Remove any kinks by twisting it.
Locate the wires for the water-level switch, and remove them from the tabs on the switch. Label which of the three tabs each connected to. Set your multimeter, a device used to test electrical current, to the X1 setting. Test the tabs in pairs, making all possible combinations (such as tab one and two, one and three, two and three). The multimeter should read infinity or close to zero for each pair. Replace the switch if any other reading is present.