2001 Grand Caravan Climate Control diagnosis and code reset

I am having problems with my HVAC system. I know the power and recirc 
button trick to recalibrate but it is too cold, I think, to get it to 
perform currently. (I read somewhere that ambient temperature has to be 
50ish degrees.)

Are there other button pu****ng configurations to generate error codes, 
and if so, does anyone have a list of these error codes and their
meanings.

Thanks much

Allen