Scott B Houston , TX February 23, 2019 Appliance: Samsung Refrigerator RFG298AAWP/XAA Samsung Refrigerator Rfg298aawp/Xaa / : Samsung refrigerator was freezing up. How to replace Refrigerator Defrost Thermostat. Placed a hair dryer in side the refrigerator to melt the ice behind the inside panel. Replaced the heater, thermostat, and temperature sensor. So far it is working properly. Will check for ice in a few days to see if any ice is building up 6 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours