Hi I am Joel and I will be helping you today,
That model has multiple solenoids on it one for the ice maker one for the water dispenser, so just because the water dispenser is working does not mean the valve is good it is common for the ice maker side of the valve to go bad, try manually putting water in the ice maker using a turkey baster or something similar and see if the ice maker cycles and dumps the ice if so the valve is bad, if it does not cycle the ice maker is bad. It usually is just a bad valve in most cases:
Refrigerator Water Inlet Valve Assembly
Part #:###-##-####- click here for part
If you have to change the valve its on the rear of the unit just follow the water lines on the rear of the unit and you will located the valve.
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