Start with the easy stuff before throwing money at it...
Have you put the fridge in diagnostic mode? What is the code showing?
Disconnect the thermister. Thats the thingy attached to the fins inside the box. Follow the wires to the top and unplug it. The light will be disconnected as well. The thermister is simply a thermostat so don't expect your box to ever cycle with it disconnected. This means the fridge will cycle by time rather than by temp. If that doesn't work then you'll have to dig a bit deeper.
1. Take a picture of the wiring at the back of the fridge in case one or more have to be removed.
2. Remove the cover on the black box affixed to the back of the fridge. Inside are two fuses. Use a meter and determine both of these fuses are good. If the 120V fuse is bad, make sure it's replacement is a slo-blo fuse.
3. If both fuses are good, then reset the recall box. You can do this once, then Norcold says you'll have to take it to a dealer. The dealer will reset it for you with a large magnet. (Note-you can do this yourself)
4. You can reset the control board yourself with a small jumper. I used a short piece of telephone wire as they are #18 solid copper. See page 12 of the manual for instructions. You'll hear a distinct click when it resets.
Remember the freezer cools first, then the box.
I played around with mine for two years AFTER replacing the cooling unit with the Amish. I finally chucked it and installed the Samsung 197. You might consider the same route and save yourself a lot of aggravation....best of luck...Dennis