I have a blower motor that runs all the time even if the thermostat is in the off position, system runs just fine other than that. I thought it was the contactor and replaced it with a new Blower control board . But the motor still runs all the time and the board gives me a code that says the burner rollout switch is open but it is not it has continunity . Anyone have something else I can try?

Just a guess but have you checked the AUTO - ON position of the fan switch on the thermostat?