I have a Carrier central air unit which came with my new house eight years ago. Today I started feeling warm and that's when I noticed that the central air unit was not running. At the moment it's over 80 degrees inside the house. I always keep the thermostat (White-Rodgers) settings as follows: FAN: Auto SYSTEM: Cool Today I turned the unit off. Then I went outside by the unit and had someone inside the house turn the unit to the above settings. Whenever they turned the unit on, I would hear a single click, but that was all. The unit did not turn on. I checked the attic unit pan and noticed that while the pan floor was wet there was no measureable amount of water in the pan. (See below.) I've had similar problems in the past. At those times I would turn the unit off for at least five minutes and then turn it back on, and usually the unit would turn on and cool the house normally. Sometimes I had to do this more than once in order to get it to turn on and work normally. Also at these times, whenever I checked the attic unit pan I always noticed approximately three-quarters of an inch of water in the pan. As mentioned above, today there is not a measureable amount of water in the pan. I would greatly appreciate hearing from anyone who might be able to help me get my central air unit working again. Thank you.