First locate the water inlet tube where it passes through the back of the refrigerator cabinet wall. Use a small screwdriver or other suitable probe to check that tube and make sure it is not obstructed by ice.
Look on the bottom right hsnd side of the Ice Maker control head and you should find a small plastic or rubber cap that is snapped into the test plug.
Pry the cap off and you will see two small holes.
You will need a piece of insulated electrical wire about 2" to 3" long.
strip the ends of the wire back about 3/8" and bend the wire into a U shape.
While carefully holding the wire by the insulated section insert one tip of the wire into each hole. The wire will contact the internal test points to bypass the internal thermostat and start the harvest cycle. Keep the wire in place for about 15 seconds, or until you see the wire lift arm begin to rise and the cube rakers start to rotate.
The lift arm will go to the full up postition and the cube rakers should rotate through the cude mold.
Carefully feel the underside of the cube mold. The cube harvest mold heater should be on and the mold should be getting hot. Be very careful as that heater gets very hot, very quickly.
As the cube rakers near the 10 o'clock position you should hear the water fill valve solenoid activate and it should begin filling water into the mold.