I think you are talking about the outdoor unit so see if you can hear the compressor running. If it isn't running then set the thermostat so that the unit is not running and give the pressure time to come down.(15mins-30mins) Discharge pressure will build up if the fan isn't running and cause the compressor to shut down that's the reason for doing this. After this set the thermostat to call for a/c then see if the compressor is running. If it isn't first check your circuit breaker or disconnect or fuses. One of these should be located close to the outdoor unit. If you have power and it's not running then look at the contactor to see if it is pulled in. The contactor supplies both the fan and compressor. After that then check you capacitor. Some use a double capacitor that works the fan and the compressor. Let me know what you find
Answers & Comments
I think you are talking about the outdoor unit so see if you can hear the compressor running. If it isn't running then set the thermostat so that the unit is not running and give the pressure time to come down.(15mins-30mins) Discharge pressure will build up if the fan isn't running and cause the compressor to shut down that's the reason for doing this. After this set the thermostat to call for a/c then see if the compressor is running. If it isn't first check your circuit breaker or disconnect or fuses. One of these should be located close to the outdoor unit. If you have power and it's not running then look at the contactor to see if it is pulled in. The contactor supplies both the fan and compressor. After that then check you capacitor. Some use a double capacitor that works the fan and the compressor. Let me know what you find