Ralph H Vancouver , WA June 24, 2014 Appliance: General Electric Refrigerator TFX22ZPBEAA Ge Refrigerator Tfx22zpbeaa: Frosting up and not cooling properly. How to replace Defrost Heater Assembly. Replaced the defrost heater and thermostat. Removed the back panel in the freezer. Defrosted coils with a hair blow dryer. Removed defective unit and installed new replacement. Refer is back to normal operation. Took more time to defrost than to remove and install heating unit. 11 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes