Pop the front cover off of your ice maker. On the right hand side of the unit is a small screw. that the cover conceals. This is the water fill screw. Adjust it counter clock wise 1/4 turn and see if that stops the problem. If not then turn it a full 1/2 turn more. If it still over fills then the unit will need to be diagnosed further.
Please let me know if this does not solve your problem.
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