Customer Questions and Answers for Refrigerator Temperature Sensor by Samsung

Jojo, the freezer thermistor should not read open. This would indicate either the sensor is bad or that there is a wiring issue depending on where the resistance was checked from. If the sensor read open where it plugs into the freezer wall, then the sensor is bad. As it is reading no resistance, the control is not able to properly read what temperature the freezer is at. This will cause the control to attempt to cool the freezer down to temperature constantly, thereby causing frost build up.