My outside central AC condensor/compressor unit (a Lennox) is not turning on at all. When I switch on the thermostat, the blower in the basement starts running and air is coming through the vents, but the outside unit is not turning on at all, so there is no cool air. Is the likely problem a blown fuse in the outside unit?

Check your breakers and fuses, the Lennox A/C units (some) have a manual reset high pressure switch in the out side unit. Turn off power , remove access panel on A/C look for a red button and push it in, close panel, turn power back on and if it runs , take a water hose and wash the condenser coil (outside unit) Good luck. Mike

Mike - I pushed the red button but that did not result in it turning back on. I do hear a pop noise where the electrical lines connect to the outside unit. Fuses?

Possibly, chech the fuses,the pop may be the contactor pulling in or a dead short, does it pop the breaker when ot does this?

It was the fuses. Thanks, this is a great site!

My outside ac unit won't come on worked good last year inside fan works outside fan was frooze I got it free but still not coming on can u give me some pointers

My lennox central ac starts outside after 2minutes breaker on compressor goes out what's wrong

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Originally Posted by augitorres

My lennox central ac starts outside after 2minutes breaker on compressor goes out whats wrong

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and inside blower still works but out side the maual swithch keeps trippin