Thomas M Lebanon , MO May 27, 2018 Appliance: General Electric Refrigerator PDS20SCRARSS Ge Refrigerator Pds20scrarss: Unit was freezing up was not defrosting. How to replace Temperature Sensor. After review on appliance parts which indicated this part was defective on over 80% of icing over conditions. I purchased the thermistor/temperature sensor for less than $10. And I received the part quicker than anticipated, a nice surprise. So far so good, the unit has not frozen up. I was not able to get electrical prints to check the heater element. So I will continue to monitor the refrigerator temperature, time will tell. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes