So I am at the RV storage place now. Burnishing the thermostat did not help. The fan still runs even if I disconnect the thermostat wires. If I fire up the propane and turn the heat up on the thermostat, it blows hot air. However, when I turn the thermostat off it continues to blow but cooler air.
I just went out side and wrapped lightly on the board with h a screwdriver and the fan finally shut off. I read to try that if the relay was stuck. It worked. Now I have turned the heat back on and let it run for a while and am waiting to see if the fan stops on its own.