Product review (5 stars): Saved me a $300 service call!
Have had this part in my 8 year old GE Monogram refrigerator and it solved the problem for the freezer and eventually the refrigerator not cooling enough.  Saved me a $300 service call - amazingly!  Highly recommend if you see ice building up in your freezer section, due to the defroster not triggering.  This part will trigger your defroster, clearing the ice-buildup and allowing your freezer to perform its basic duties again.