On that unit the most common issue for that model is the ice maker system has its own evaporator, behind the ice bin area there is a fan that circulates air to the ice maker if that fan is bad or not blowing it will not allow the ice maker to freeze the water. Click here for image
you will need to check it out and see if the fan is blowing, if not and it is getting voltage replace it:
Refrigerator Ice Maker Evaporator Fan
Part #:###-##-####- click here
However if that fan is blowing and the there is ice in the ice maker mold and its not dumping, let me know. In the meantime:
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