I started in the freezer to no avail. If you notice your refrigerator is too warm, too cold, or not defrosting properly, then there may be a problem with your sensor. This sensor (Temperature Sensor, Thermistor, Refrigerator Temperature Sensor) sends the temperature reading of the compartment to the control board. How to Test Freezer Temperature Control. Actual Temperature - This display removes the guesswork in setting refrigerator temperatures. Your appliance may differ depending on the manufacturer and model. Note: This video is intended to give you the general idea of the part replacement procedure. Step by step instructions on how to replace a Temperature Sensor #WR55X10025 for Refrigerator made by GE. Data from the electronic sensors constantly measure the interior fresh food and freezer temperatures. The refrigerator-freezer temperature controls the operating temperatures of both the freezer and refrigerator compartments. Once the desired temperature has been set, the temperature display will return to the Actual Temperature display for both the fresh food and freezer. After more research and testing I was able to diagnose the problem as the refrigerator evaporator temperature sensor / thermistor and most likely not related to the freezer at all. So I began to test things to try to test and diagnose the problem.