My upstairs heat will not turn on in the AUTO setting . I hear the click on the thermostat for it to turn on but the fan will not blow. I can turn it on to "FAN ON" and it will blow but when I change it back to "AUTO" the fan shuts off and won't come on.
Any ideas?

Fan on and heating use different windings in the motor and a different relay to control it. Likely the relay on the control board is bad. You might do some checking, but likely you will have to replace the board.