Atwood RV Furnace will not start after changing propane cyl

Was this ever resolved? I have the exact same issue. I was on a spare LP tank then switched back over to my main tank. Now the furnace will not light (fan does not clear the chamber, nothing happens). I am able to jumper to run the fan so we know the motor is working and power is making it to the furnace. I tried jumping the two blue (thermostat) wires and even after waiting for the delay, nothing happens. I gave up and assumed the board had gone bad so i ordered a new board and still nothing happens.