My Whirlpool ice maker was barely making any ice. Now it has completely quit. I cycled the unit, but that was no help. I tried to switch wires on valve luges to a different size. The fill tube froze up. I cleaned both the inside tube and the plastic tube through back of the refrigerator. Then I cycled the unit again. This time I heard the valve open, but very little water came into the cube tray. Any other thoughts?