Thermostat and breaker
Thermostat set to cool. Check for a tripped AC breaker and reset it once only.
Outdoor AC unit not running, or the compressor won’t start?
The outdoor condenser holds the compressor and fan that move heat out of the building. When it stops, the indoor fan may still blow, but the air stays warm. Turn the system off and call 833-877-1717. RepairNowUSA connects the request. An independent HVAC technician does the repair.
Am I in the right place?Yes if the outdoor unit is silent, hums, trips its breaker, or runs but the air is warm.
Is this urgent?Yes in hot weather or with vulnerable people inside. If anyone shows signs of heat illness, such as confusion, dizziness, nausea, or hot dry skin, call 911 and move them somewhere cool.
What do I do next?Turn the AC off and call 833-877-1717 with the ZIP code and what the outdoor unit is doing.
Humming without starting is often a capacitor: AC capacitor repair. Refrigerant loss: refrigerant leak.
RepairNowUSA editorial review · Last substantively reviewed October 13, 2026 · Review standards
Quick checks
Outdoor disconnect
A box on the wall near the unit. Make sure it was not switched off or pulled.
Clear around the unit
Leaves, grass and debris against the coil make it overheat. Keep about 2 feet clear.
Leave the unit closed
Do not open the outdoor unit, touch the capacitor or wiring, or handle refrigerant. Capacitors hold a dangerous charge even with power off, and refrigerant work requires EPA certification.
Common outdoor unit failures
Capacitor or contactor
The most common reasons a unit will not start.
Fan motor
The fan stops, the compressor overheats. See AC fan repair.
Compressor failure
The costliest repair, sometimes leading to unit replacement.
Dirty or damaged coil
Bent fins or heavy dirt block heat transfer.
What to have ready when you call
- Property ZIP code, home or business
- Outdoor unit silent, humming or running
- Whether the breaker trips
- Any burning smell
- Age and brand of the system
- Indoor temperature
What happens when you call RepairNowUSA
- Describe what is happening in plain words and give the property ZIP code. You do not need to know which trade to ask for.
- RepairNowUSA checks for a participating independent provider who handles AC compressor and condenser repair in that area.
- If one is available, you are connected. The provider confirms timing, access, scope and price with you before any work.
- The provider, not RepairNowUSA, diagnoses and performs the repair.
RepairNowUSA is a referral and connection service. Provider availability and response times vary by location, time and demand, and are not guaranteed. Before you approve work, ask what was found, the price, the timing and what is not included.
Call 833-877-1717Compressor and condenser questions
Why is my outdoor AC unit not running?
Power, a failed capacitor or contactor, a tripped safety, a failed fan motor or a compressor problem.
Is a bad compressor worth repairing?
It depends on the age of the system, the refrigerant type and the price. The technician explains repair versus replacement.
Can I call at night?
Yes. You can call 833-877-1717 at any time, including nights, weekends and holidays. Whether an independent provider can come out right away depends on your ZIP code, the time and provider capacity, so availability is not guaranteed.
Do providers work on all AC brands?
Independent HVAC providers commonly work on major brands such as Carrier, Trane, Lennox, Rheem, Goodman, Bryant and York. Tell RepairNowUSA the brand on the call. RepairNowUSA is not affiliated with or authorized by any manufacturer, and warranty work may need the manufacturer’s own network.
Authoritative references
These public sources give general safety context. They do not replace an on-site evaluation, and RepairNowUSA does not perform the work.