Why does my AC keep tripping the breaker?

By Dana Whitlock. Updated October 2026. Repair or replace?

A breaker trips when a circuit draws more current than it is rated for, or when there is a fault. With a central AC, the trip usually means the compressor or fan is struggling to start or run, or there is a short somewhere in the unit or its wiring. Resetting once is reasonable. Resetting it again and again is a bad idea, because the breaker is the thing keeping a fault from becoming a fire.

Likely causes

A dirty filter or blocked condenser Safe to check

Poor airflow on either side makes the compressor work harder and draw more current. DOE recommends regular filter changes and keeping the outdoor unit clear of debris and plants by at least 2 feet.

A failing capacitor or hard-starting compressor Pro job

A weak capacitor or worn compressor pulls a large surge to start, which can trip the breaker. Capacitors hold a charge even when off, so this is a licensed HVAC technician's job.

A short in wiring or a motor Pro job

Damaged wiring, a grounded compressor or a shorted fan motor will trip the breaker instantly. DOE lists corroded wires and terminals among common AC problems. This is technician or electrician work.

A worn breaker or loose connection at the panel Pro job

Breakers can weaken with age, and loose connections heat up. Anything inside the electrical panel is a job for a licensed electrician.

Safe things to check first

• Turn the thermostat to Off before touching the breaker.
• Reset the AC breaker once by pushing it fully off, then on.
• Replace a dirty air filter.
• Clear leaves, grass and clutter from around the outdoor unit.
• Turn cooling back on and wait. If the breaker trips again, leave it off and call. Do not reset it a third time.

When to stop and call

If the breaker trips a second time, stop. NFPA's electrical safety tips say to call a qualified electrician for frequent problems with tripping breakers or a burning or rubbery smell from an appliance. For an AC, start with a licensed HVAC technician, who will test the compressor, capacitor and wiring at the unit. They will bring in an electrician if the problem is at the panel. Never tape a breaker on, swap in a larger breaker, or open the panel cover.

Repair or replace?

Start with its age. Type the serial from the label:

The answer turns on what the technician finds. A capacitor or contactor is an affordable fix on almost any unit. A shorted or grounded compressor on an older system usually is not worth repairing. DOE's analysis gives central AC about 24 years in northern and hot-dry climates and about 18 in hot-humid ones, while a 2007 builders' survey listed 10 to 15 years. Date the system with the age decoder above and set any compressor quote beside the replacement range above.