Hello everyone,
I joined this forum yesterday "Christmas day" because I was having intermitten problems with the climate control panel. It was displaying all the traits everyone has listed here and more. I was getting code 31 when I ran the diagnostic.
I had my father look at it and he noticed that when the plug in the back (8 pin) was wiggled the problems listed here would recreate them selves. So I took it apart like I have done many times before. The only difference this time is that I took the small circut board out of the aluminum back casing and looked at the conection for the 8 pins on the back of the circut board. There were definately cracks in the solder for at least 5 of the 8 pins. I fired up the soldering iron and added some rosin core solder to each of the 8 connections reinforcing them quite a bit. This has resolved the apparent problems. However I have yet to run diagnostics on the panel again because it seems to be working just fine now.
I hope this can help someone before they spend hundreds/thousands on another ATC.
Michael