The blower on my Trane xe90 is always running I set the the thermostat to off and it still runs. The only way I can get it to turn off is to shut the furnance off at the shutoff. I just replaced the circuit board just over a year ago. I read other forums and they say the the fan relay. I think that is integrated in my circuit board, but I am not sure. Please let me know where to go next.