My AC Unit just quit working? The Fan does not come on, I have tried heat, A/C, Fan Only... checked all the breakers, there fine. Changed to a new thermostat, still nothing, checked all connections. Went Outside, Checked the main unit, connections, breaker. It also was okay. I was able to remove the cover from the outside unit [Lennox] and the A/C "Compressor" Unit and fan come on when I manually pressed the relay switch. Any ideas what would cause the Main Unit to just not come on? I have my Yahoo messenger posted as well! Thanks to any suggestions! -Steve