Gordon A Buzzards Bay , MA September 16, 2016 Appliance: General Electric Refrigerator GFSF6KEXABB Ge Refrigerator Gfsf6kexabb: The defrost heater needed replacing. How to replace Heater Metal Sheath. I had an ongoing issue with the fresh food section of my refrigerator not defrosting. Neither my local tech nor the manufacturer's tech could find the problem. The defrost heater showed there was a circuit. However, I was able to access the diagnostic program (which neither tech used!) and discovered the problem. I ordered the part on a Monday. It arrived next day and was easily installed the same afternoon. I then ran the diagnostic again and no other problem presented itself. I am especially satisfied with the service at AppliancePartsPros.com. BTW, I have tried other services for parts and am greatly dissatisfied with these other suppliers One final caution is be careful if you use the manufacturers schematic to order parts. There are errors on them. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes