Ok, my central air doesn't work, my central heat does. Took the panel off the unit and found out:
Blue (Rc) - Yellow = 0 volts Red (Rh) - White = 24 volts AC
The furnace is new, put in last year by a professional installer. The AC is old, and may or may not have problems of its own (I've not had the house long enough to need it)
My pal Google tells me there may be a fuse on the board, which I will check tomorrow. But wouldn't a blown fuse keep anything from working? If the fuse is good, I'm guessing the board is bad, but with it being new that seems unlikely. Anything else I should check?
Thanks.