September 28, 2026
California’s Central Valley and Bay Area experience summer heat that consistently averages over 90°F. Most of us rely on our air conditioners to make the evenings tolerable, but what do you do when your AC keeps shutting down?
At Service Champions, our technicians get asked this a lot. Let’s go over the top three common reasons your AC is overheating to the point of shutting down.
Condenser coils are tubes running through the outside part of your air conditioner that release heat into the outside air. They’re the counterpart to the evaporator coils inside the unit that absorb heat from your home and turn the cooled refrigerant into a gas. That hot gaseous refrigerant travels to the condenser coils, where the fan cools it, returning it to liquid refrigerant that flows back to the evaporator coils.
During the winter months, dust and debris collect around the outside unit, in the compressor fins, and around the coils. This build-up acts as an insulator, and the refrigerant can't effectively release the heat. Your compressor will keep running until it overheats, and the air conditioner shuts down because it can’t reach your thermostat temperature setting.
If your air conditioner’s overheating and shutting off, it may be due to a lack of airflow. Poor airflow can happen when:
When the air can’t flow through the air conditioner, it no longer removes heat, trapping it within the equipment and causing it to work harder at a higher temperature. Critical components heat up, eventually tripping the safety sensors.
Air conditioners use refrigerants to remove heat from your home. Unlike gasoline in a car, refrigerants don’t get used up. Instead, coolant cycles back and forth through a closed system. That said, your AC experiences wear and tear over time, and parts degrade. Fittings can loosen, valves can fail, and leaks can occur.
If your air conditioner has a refrigerant leak, the compressor will struggle to maintain pressure, causing the system to lose its ability to effectively cool. Your AC works harder to meet demand, eventually overheating, short-cycling, or shutting down completely.
It’s not always easy to tell the difference between normal wear and a symptom of a bigger issue. Below are some signs and symptoms associated with a dirty air filter, dirty condenser coils, and low refrigerant levels:
If you’re wondering, “Why does my AC keep shutting off?” the answer is likely because it’s overheating. During an extreme California heat wave, temperatures could exceed 110°F for several days, with uncomfortable heat lasting through the nights. These periods of prolonged heat strain your equipment and can eventually lead to the air conditioner overheating as it struggles to keep your home cool.
If your air conditioner turns off after running for a short time or during the hottest part of the day, it could be because it’s overheating and safety measures are kicking in to interrupt the power. This is by design to prevent permanent damage to the cooling equipment.
The air conditioner shuts down to prevent parts from melting or burning in the high heat, and the power remains off until you manually reset your AC unit. If the air conditioner won’t turn back on, blows warm air, or starts making strange sounds when it comes back on, it may require professional repairs.
One of the most common AC compressor overheating symptoms is short-cycling, when the AC shuts off entirely. If the AC compressor is overheating, the thermal overload protection switch eventually trips. This is a safety mechanism that shuts off the compressor. If this switch didn’t trip, the compressor’s motor oil could degrade, electrical components could short out, and the motor could completely burn out.
If you notice AC compressor overheating symptoms, shut off the air conditioner and contact Service Champions for assistance.
Regular air conditioner maintenance prevents your AC from overheating in the summer by allowing our highly skilled technicians to address minor problems before they become major issues. We recommend booking an air conditioner tune-up at least once a year for routine cleaning and inspection.
Clean air filters do more than provide good indoor air quality. They also serve as a safety net, protecting your air conditioner from dirt and pollutants. A dirty air filter reduces airflow to the system, strains the fan motor, and forces your air conditioner to run longer and harder to cool your home. A dirty air filter also traps cool air in the unit, causing ice to form on the evaporator coils. This makes it harder for the compressor to do its job.
If your outdoor air conditioning unit and its condenser fan become clogged with yard debris or infested with pests, this can create serious problems. The condenser fan blows air across the condenser coils to dissipate heat. If it can’t do its job, the air conditioner won’t be able to effectively dispel heat, causing the pressure inside to skyrocket and the entire system to overheat. Regular maintenance, like landscaping and scheduling tune-ups, helps keep your outdoor AC unit clear.
There are a few steps you can take to prevent damage to your air conditioner before calling us for assistance:
Sometimes you need professional air conditioner repair. If your air conditioner keeps overheating, trips the breakers, or if you have a refrigerant leak in your air conditioning unit, it's time to call a professional. A highly trained HVAC technician can troubleshoot, locate, and repair the issue, replace the refrigerant, and ensure your AC is running safely again.
At Service Champions, we offer online scheduling, award-winning service, payment plans and financing options, and a 100% money-back guarantee. Local homeowners choose us because we offer:
Choose Service Champions for heating, cooling, plumbing, electrical, insulation, and indoor air quality across the Sacramento area, South Bay, Concord, and the East Bay.
Contact Service Champions today!