well, the good news is the fan works in "on" position with no heat. I tightened the nut on the furnace where blue goes in and it worked. HOWEVER, the heat now doesn't go on!! I've tried waiting a while before switching to heat, tried turning power off to furnace and on again, but no heat. What color wires are for heat? Maybe I need to adjust those too???? Maybe they got unhooked while I was fiddling with all that electrical tape surrounding the splice. Yikes, I'm going crazy.