I just got the unit install 2 weeks ago. I came home one night and notice the place being warmer than usual. I realize that it's blowing just air through the vents. I've check the outside unit and realize that the Trane xl 14i fan keeps stalling It will try to start, but then it will shut down again. Just to be safe I've switch off the unit. What could the cause of this new unit to not work. Anyone can help out there?