For the past 3 years I've been jumping the J9 to J11 terminal on motherboard to defrost the coils. This needs to happen every couple of days and takes about 2 hours. If I put my fingers in the dampner door I can break out the ice, also at the intake vent I can see ice. Temps are approx. -8 and 40 degrees when I resort to jumping defroster every couple days.
I've replaced the mother board (twice) and the water tray with heater below the coils (it drains fine). When I put frig in diagnostic mode everything seems to check out okay. The Climate Control Drawer has no led readout and has not worked since before defrost problem.
I got a spare refrigerator yesterday. I'm ready to fix this problem NOW. Where do I start? Replace all Thermistors? Replace all heaters?