GE profile refrigerator french door, bottom freezer #PFS22SBSBSS will not stay cool. Regrigerator will continue to get warmer and warmer and freezer is too cold. We have already replaced the mother board, twice, and the thermodisc. The coils in the back of freezer are freezing up after two days and ice starts to appear on back of inside freezer. Please help!

You have a bad thermistor. Here is a manual: https://dl.dropbox.com/u/8010163/GE_Bottom_Freezer_Ser_Man.pdf