Why Does My AC Keep Tripping the Breaker? A Phoenix Homeowner's Guide

When your AC keeps tripping the breaker, the breaker is doing the job it was built for. A tripped circuit breaker is a safety device that cuts off power to the unit during an electrical overload. That means repeated trips point to an electrical problem somewhere in the system. If you are comfortable doing so, one careful reset is a reasonable first step. If the breaker trips again, turn the AC off and have a qualified HVAC professional inspect it for an electrical fault.

That can be hard to accept on a warm Phoenix afternoon when the house is heating up. Still, a breaker that won't stay on is a signal worth listening to. There are a few safe checks you can make yourself, and there is a clear point where the job belongs to a technician.

What Does It Mean When Your AC Trips the Breaker?

When your AC's breaker trips, the result is easy to spot. A tripped breaker is a common reason for an AC unit not turning on.

A single trip may be a minor electrical interruption. In that case, resetting a tripped breaker can restore power without professional help. Frequent trips are a different story. A home electrical-safety campaign from the U.S. Consumer Product Safety Commission listed "frequent circuit breaker trips or blown fuses" among the telltale signs of electrical problems in a home.

Key Takeaway: A tripped breaker means a safety device cut power during an electrical overload. The U.S. Consumer Product Safety Commission has listed frequent circuit breaker trips among the telltale signs of electrical problems in a home.

How to Reset the Breaker Once, and Why Not Again

Start at your home's electrical panel. Look for the AC's breaker in the "Off" or neutral position, and check the disconnect box near the outdoor unit as well. Only reset a breaker if you are comfortable doing so. If you are, Carrier's reset instruction is to "turn it fully to the OFF position and wait about 5 minutes before switching it back ON. Then allow the air conditioner a few minutes to restart."

What happens next tells you a lot. The troubleshooting guide is direct about it: "If the breaker trips immediately after resetting, do not try again. This indicates a deeper electrical fault that requires a professional who knows how to troubleshoot an air conditioner safely." Resetting it again and again doesn't repair whatever caused the trip.

Whatever kind of system you have, check its manual too. For example, the operating instructions for two of Mitsubishi Electric's split-type air conditioner models list "When the breaker trips frequently" as a reason to stop using the air conditioner and consult your dealer.

Key Takeaway: Only reset an AC breaker if you are comfortable doing so. Switch it fully off, wait about five minutes, switch it back on and allow the AC a few minutes to restart. If the breaker trips immediately after resetting, do not try again. That points to a deeper electrical fault that calls for a professional.

What a Technician Looks At When the Breaker Keeps Tripping

When the outdoor unit is faulty or broken, the issues often involve faulty capacitors, motors, or compressors. Here is what those parts, and a few related conditions, do in your system:

• Wiring and connections. Loose or damaged wiring disrupts the electrical flow your system needs to run. Faulty electrical connections can also cause unsafe operation of your system and reduce the life of major components.
• Capacitor and contactor. These parts are critical for starting the compressor and fan motor.
• Compressor and fan motor. A motor that has overheated or failed will stop the air conditioner from turning on.
• A dirty air filter. A clogged filter restricts airflow, which strains the system and can lead to frozen coils or compressor failure.
• Dirty coils. Dirty evaporator and condenser coils reduce the system's ability to cool your home and make it run longer.

A dirty filter or dirty coils don't prove an electrical fault. Still, a clogged filter strains the system and dirty coils make it run longer, so both are worth having checked. The electrical parts are another matter. Carrier's guidance on those outdoor-unit parts is plain: "These are high-voltage components; do not attempt to troubleshoot electrical issues yourself."

If a technician does find a worn compressor or motor on an older system, our AC repair vs. replace decision guide can help you think through the next step.

Key Takeaway: When the outdoor unit is faulty or broken, the issues often involve a faulty capacitor, motor or compressor. Those are high-voltage parts for a professional to test, not a do-it-yourself job.

Safe Checks You Can Make Yourself

Some checks are safe and quick, and they're worth doing around that single reset:

1. Look at the thermostat. Make sure it's set to "Cool" and set lower than the current room temperature.
2. Check the air filter. Replace it if it is gray or clogged. If you're not sure how, your contractor can show you how to do this.
3. Walk around the outdoor unit. Clear away leaves, yard debris or anything piled against it. Keeping the area around the condenser free of debris is part of routine upkeep.

Stop there. Leave the electrical side to a professional. We're a family-owned heating and cooling company in Chandler, and we'd much rather you call us with a question than take a risk with live wiring.

A typical professional maintenance check-up should include tightening electrical connections, measuring voltage and current on motors, and checking the system's controls to ensure proper and safe operation.

Key Takeaway: The safe homeowner checks are the thermostat setting, the air filter and a clear space around the outdoor unit. The electrical side of an AC is a job for a professional.

Signs a Tripping Breaker Needs Prompt Attention

Some signs call for prompt attention. Burning smells, tripped breakers, or flickering lights signal serious wiring issues, and professional diagnosis is essential to prevent fire hazards. If you notice a burning smell or flickering lights along with the trips, leave the AC off and call a professional. That's the kind of problem our emergency HVAC repair service is for.

If your system has had other trouble this year, our guide to common AC problems in the Phoenix Valley walks through other issues worth knowing about.

Frequently Asked Questions

Is it safe to reset my AC's breaker?

If you are comfortable doing so, one careful reset is a reasonable first step. Switch the breaker fully to OFF, wait about five minutes, then switch it back ON and give the AC a few minutes to restart. Carrier's troubleshooting guide says: "If the breaker trips immediately after resetting, do not try again. This indicates a deeper electrical fault that requires a professional who knows how to troubleshoot an air conditioner safely." At that point, turn the system off and have a qualified HVAC professional inspect it for an electrical fault.

Why does my air conditioner keep tripping the breaker?

A breaker trips to cut off power during an electrical overload, so repeated trips point to an electrical problem in the system or its circuit. Loose or damaged wiring can disrupt the electrical flow your system needs. When the outdoor unit is faulty or broken, the issues often involve faulty capacitors, motors, or compressors. These are high-voltage components, so finding the fault is a job for a trained technician.

Can a dirty air filter cause my AC to trip the breaker?

A dirty filter is worth checking, but a clean filter won't repair an electrical fault. A clogged filter restricts airflow, which strains the system and can lead to frozen coils or compressor failure. Keeping the filter clean is good care for the system whether or not it turns out to be connected to the breaker trips.

What does it mean if my AC keeps blowing a fuse?

Some air conditioners are protected by a fuse, and a blown fuse will keep the AC from turning on. A fuse that keeps blowing deserves the same attention as a breaker that keeps tripping. A U.S. Consumer Product Safety Commission electrical-safety campaign listed frequent circuit breaker trips or blown fuses among the telltale signs of electrical problems. Rather than replacing fuse after fuse, have the system and its circuit checked by a professional. If a fuse does need replacing, Carrier's guidance is to use one matching the equipment manufacturer's specified amperage and to "never install a higher-rated fuse as a workaround."

Is an AC that keeps tripping the breaker dangerous?

The trip itself is the breaker protecting your home by cutting power during an overload. What matters is the cause. Burning smells, tripped breakers, or flickering lights signal serious wiring issues, and professional diagnosis is essential to prevent fire hazards. If you notice a burning smell or flickering lights along with the trips, leave the AC off and call a professional.

What can I safely check myself before calling for service?

Make sure the thermostat is set to Cool and set lower than the current room temperature. Check the air filter and replace it if it is gray or clogged. Clear leaves and yard debris from around the outdoor unit. Leave electrical troubleshooting to a professional, because the outdoor unit's electrical parts are high-voltage components. A typical professional maintenance check-up should include tightening electrical connections and measuring voltage and current on motors.

Should I check my air conditioner's manual too?

Yes. Follow the manual for your own unit. As one example, the operating instructions for two of Mitsubishi Electric's split-type air conditioner models say to stop using the air conditioner and consult your dealer when the breaker trips frequently.

When a Breaker Won't Stay On

A breaker that keeps tripping is protecting your home, so let it do that job. The electrical side of the problem belongs with a trained technician who can test the parts and find the one at fault.

When you'd like someone to track down what's tripping your breaker, call us at (480) 689-5167. You can also read more about our air conditioning services for Phoenix and East Valley homes.