The way to determine which is to pull the unit out from the wall, Remove the lower panel in the rear. Once off you will see the valve, Next trace the water line from the ice maker to the inlet valve, remove the water line from the inlet valve. Blow into the water line.If you can blow air into the water line then the valve is bad and will need to be replaced.If you cant blow air into the line then there is a blockage in the line, you would need to trace the blockage and thaw it with a hair dryer (normally in the fill tube running from the rear of the fridge to the ice maker)
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Mike, there is no water in the tray and it seems obvious that the problem is the ice maker itself is not getting water. I pulled the line which feeds the ice maker unit, It is clear. Is there a way to test the signal to the valve? I hate to replace the valve only to discover that's not it? Could there be a problem with the ice maker itself not sending a signal to the valve? Any diagrams you might be able to post?