I have the exact same problem although I cleared the fault codes and they do not come back but I still usually do not get heat unless the temp is set on full, I am thinking it is the control unit itself but not sure I want to take it in and see if the dealer will replace it to see if it fixes the problem.

I checked my inside sensors and they are clean and seen to be working fine and my fault codes do not come back. I find it hard to believe that both of your sensors have gone out.

Did you clear your fault codes and do they come back?
the sensors are pretty easy to replace yourself and you can get them cheaper from some place in Florida I believe.

Let me know if you find out anything or need help.

Mark

linthicum6@earthlink.net