Freezer set to 0 degrees, display reads 0, digital thermometer placed in freezer with external monitor reads 0. Freezer set to -5, display reads -5, digital thermometer reads -5. If fridge set 35, display reads 35, digital thermometer reads 47. Set at 38, display shows 38, digital thermometer reads 49. Food going bad at those temps. At max cool setting still can't get below 45.

When it worked fine, the bottom vegetable drawer used to freeze lettuce occassionally. Hasn't done that is a long time. Having milk in door sour way too soon so I'm not imaging a problem.

Compressor and condenser run fine, no dust on condenser coils.

I have had two repair folks out and, so far, I've replaced the following parts: main circuit board, inverter box, refrigerator thermistor, air baffle/diffuser. Still same problem. Removed evaporator cover. Looks fine, no uneven ice problem, not blocked with ice at all, just the fine layer you would expect with a properly working evaporator. Evaporator fan working fine. You can feel air flowing into fridge through diffuser.

Repair manual says the display won't show temperature differences between set and actual temps if the difference is less than 6 degrees (to account for temp changes caused by door opening/closing). But there's a difference of more than 10 degrees which isn't being reflected in the display.

Does the display board control how the evaporator fan and diffuser run or is that done by the main board which was already replaced? Why doesn't the display board show a 10-12 degree temperature difference between set and actual? When unplugged and plugged back in after a 1/2 hour, it did reflect a 20-25 degree difference, but I didn't watch to see at what point it went to display temp. Which logic board is responsible for the monitoring of set vs actual? Main circuit board or display circuit board? If the display circuit board, does the display board then send signal to main board to turn on compressor, evaporator, evaporator fan, diffuser, etc.? Just trying to figure out whether to spend another $150 to replace display board.

Any ideas on what to try now?

Kind of like beating a dead horse I know, but my fridge side is warming up to the point of spoilage. The freezer side has a 1/8 or so frosting on the back panel, but keeps stuff frozen. I'm getting no flow thru the damper, but ithe damper does work. My question is what is the first thing to replace with the defrost cycle...before the whole board. I've noticed there are two defrost sensors. Should I replace those and see what happens? My fridge is a GE/Hotpoint HSS25GFTAWW