Problem
The outdoor AC unit does not start, preventing the system from removing heat from the home.
Possible Causes
Tripped breaker
Failed capacitor
Bad contactor
Thermostat wiring issue
How To Fix It
Check the breaker panel
Inspect the outdoor disconnect switch
Make sure the thermostat is calling for cooling
Listen for humming or clicking from the unit
When To Call A Professional
If power is reaching the unit but it still does not start, an HVAC technician should inspect the electrical components.