I noticed no air was coming through my vents the other day but the condensing unit outside was on. The indoor blower in the inside unit isn't starting up. How can I check to see it is the run capacitor? If I check it and it isn't that what else could it be? Is there any fuse I can check or something. Right now the motor just makes a humming noise like it is trying to start. That is why I figured it may be the run capacitor.