Pressure Switch Stuck Closed --heat works but A/C doesnt

I have a coleman g8c07512mub12g HVAC system. I have recently had a control board replaced because of a lightning strike. The heat was working fine when the control board was replaced, but no one ever checked the A/C. I tried to turn on the A/C and the control board flashes twice (indicating pressure switch closed), and no fan or anything else turns on. The heat still works fine.

Would you think this is a bad pressure switch even though the same pressure switch works for the heat?

Please advice me on how to proceed.

Thanks