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An Ice maker is a fairly simple thing, it has a valve and a ice maker.
To determine which part has gone wrong it is a simple process of feeling inside the ice maker mold, if you feel ice then the ice maker has a bad contact or motor, if the mold where the ice is made is empty then the problem here is going to be one of two, either the valve has failed or there is a blockage in the water line running from the valve to the ice maker.
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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