Stephen F Port Orange , FL April 19, 2019 Appliance: General Electric Refrigerator TFX27PFSMWW Ge Refrigerator Tfx27pfsmww: Error code “def” freezer was freezing up and defrost was not working. How to replace Defrost Heater With Thermostat (Refrigerator). Ordered defrost heater harness with thermostat, added next day ship and got my part on time! Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes