de light flasing on freezer door electronic disply

I removed the back wall panel inside the freezer compartment(approx. 6 screws). The coils were very iced up. I manually defrosted the the coils with a hand hair dryer. I then removed the 2 screws from each heater element and the clip-on thermostat from the coil. I pulled the elements, thermostat and wiring harness(item 230 on parts diagram) out of the freezer compartment and installed the new assembly. Electronic self-check of the defroster indicated normal. Further checks indicated the lower heating element was open.