Check for power at the contactor. If no power there, check the circuit breaker, disconnect, or fuses. If there is power at the contactor, set the thermostat to call for a/c then check the contactor to see if it is pulled in. If it isn't check for 24vac at the contactor. If no 24vac then go to the thermostat and place a jumper between R and Y; that should make the contactor pull in if everything is good. If it does pull in when you install the jumper the problem is your thermostat. Let me know what you find.
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