Originally Posted by bubbles
SYSTEM "OFF" = FAN "ON"... SYSTEM "HEAT"= FAN "AUTO". Can't have it both ways. The heater has to control the fan due to propane as a heat source fuel. You can select fan ON or AUTO using A/C and set the fan to HI or LO for the A/C fan speed. If in AUTO for A/C the fan speed will be HI.
Not really sure what your getting at here.
Op wants furnace to run but also have a/c fan to run.
With the thermostat I have pictured it will work that way as we do it all the time to evenly heat the sabre.