It appears that the water is not getting to the ice maker. Water is getting the "part" at the bottom of the refrigerator but does not seem to be moving up. My refrig model is RT18AKXKQ and the part # that I am referring to is "model 70, MOPD 150 psi, 2210436. Any suggestions are appreciated. Thanks

Refrigerators - Roper - RT21AKXKQ Top Freezer Refrigerator