The ice maker will stop producing ice if the ice level control board has failed. These boards use an infrared beam to sense the ice level in the ice bin/bucket.
They send a signal for the ice maker to produce more ice. If the ice level control board has failed or is faulty the ice maker will not produce ice. The control boards tell the ice maker when it is full, when to dump the ice and when to fill with water. These ice level control boards are used on some Whirlpool, Kenmore, Maytag and KitchenAid refrigerators. The old part number is 4389102.