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Since the interface control also controls the temperature, you'll want to check the wire connection up in the top hinge of the freezer door. Sometimes if you unplug the plastic molex connector you'll see a burnt contact in the plug which cause cause the dispenser to not light up, but other than that, you'd be looking at replacing the main control board on the back of the refrigerator. Below is a link to the part you'd want to order and replace.
CLICK HERE for control board
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