Carrier model 58 pav flashing red light does not flash. Has 110 ac to furnace.reset black switch behind door and still no red light code.

I'm not sure if that light is 120 or 24 volts. Look for a small automotive type fuse (probably 3 or 5 amp). Remove the fuse & inspect to see if it is blown. If so, replace with a new fuse & try again. If the fuse is good, the board is probably bad.