My Outside AC Unit Is Not Running
If your indoor air handler is running but the outdoor condenser unit is not, the cause could be a tripped breaker, a failed capacitor, a faulty contactor, or a thermostat issue. Some checks are safe for a homeowner; electrical components inside the unit should only be serviced by an HVAC technician.
What to Do Right Now
The indoor AC unit is running but the outdoor condenser is silent, the fan is not spinning, or the unit makes a humming sound but does not start.
What Not to Do
When to Call a Professional
Call an HVAC contractor if the breaker is not tripped, the thermostat is set correctly, and the outdoor unit still will not start. A humming sound with no fan movement often indicates a failed capacitor or contactor — both require a technician. If the breaker trips repeatedly when the AC tries to start, do not keep resetting it.
Tell Us What's Happening
We'll connect you with the right professional for this problem.
Describe the problem or choose a service below
No spam. No obligation. We'll only contact you to match you with the right contractor.
Related Contractor Types
My Outside AC Unit Is Not Running — Questions
The indoor air handler and outdoor condenser run on separate circuits. If the outdoor unit's breaker has tripped, its capacitor has failed, or the contactor is stuck, the indoor unit will run but no cooling will happen. An HVAC technician can safely diagnose which component has failed.
