Originally Posted by
tech-c2
I looked at a friends payne pg9mtav36075abss furnace the other night.
T = 2 Stage
V = Variable Speed ECM Blower
The control board does control the blower "ON" and "OFF" in Heat and Cool modes.
There are many dip switches on the control board for setting blower speeds. I would find the install manual and make sure it is set up properly, then do some VOM testing, before I'd condemn the board.
As, Joehvac25 said, we can't go into too much detail in this "OPEN" forum. Apply for Pro membership, you won't be disappointed.
Instead of learning the tricks of the trade, learn the trade.