Product review (5 stars): Solved my eternal frost on coils at the back of my GE freezer
My GE PSW26MSRB SS refrigerator had its coils at the back of the freezer completely covered with frost/ice.  The defrost heater was not blown, so I exchanged the existing/blown (the size of it had expanded & contorted) defrost thermostat out with this one.  After putting in this factory part, the defrost heater immediately fired up and the frost was melted within minutes.  Easy fix after you remove the contents, shelving and back panel of the freezer.