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Old 06-23-2009, 02:49 PM   #1
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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

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