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The fill tube freezes for one of two reasons. Either your electronic water valve isn't sealing off properly so it's causing water to drip through very slowly which freezes the tube shut, or the water pressure going to the entire refrigerator is too low causing the water to freeze partially each time the icemaker fills up. Make sure the water pressure to the refrigerator is good and if so the electronic water valve on the back of your refrigerator where the water supply line from your house connects to the refrigerator itself will need to be replaced.
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