Earlier this week my air conditioner stopped working for the first time since I've lived in my condo. When the air would kick on, the unit outside was just making a buzzing noise, but the rotor wasn't spinning at all! I was going to call for maintenance, but then the next day it worked perfectly all day long. But then yesterday it stopped again, so I figured I should call someone. I looked up maintenance on the Lennox website, and found a place really close to me and called them at lunch, and they had a guy here in only ten minutes. I couldn't believe what the problem was - ants! It turns out that ants are attracted to the electrical contacts, and they crawl in there and get electrocuted, but all their dead bodies eventually start preventing the circuit from closing. The guy replaced the contact unit and showed me the old one - there were hundreds of dead ants in there (so many in fact that he said he was going to show it to their training class!). He sprayed some super ant killer inside there, and also checked everything else out on the A/C, which is working perfectly now. I'm so glad the problem turned out to be something so simple, even if it was pretty bizarre!