OK while changing my thermostat from manual to digital I had to change the circuit board in the attic furnace it looks the same but a slight difference it a goodman 5 ton 13 seer... any way. When I change the thermostat my heating work great fan blow when it on. Now its the summer I switch it to cool no respond fans not running or the ac kick. Seem like its dead... but I switch it to heat it work just fine. What m I doing wrong.?

Sounds like you didn't hook something back up right... double check your wiring. Do you have a schematic?

Hmm thank let me look at it this evenning.. thank u oh yes I do.have one