Eight Reasons Why Your AC Won’t Turn On-And What to Do

Things can get warm fast when your air conditioner won’t turn on in the U.S.. Thankfully, Service Experts Heating, Air Conditioning & Plumbing is here to help you keep your cool, even when your AC isn’t starting properly. Here are eight typical reasons why your air conditioner won’t turn on and how to fix them. 

1) Check the Thermostat 

The simple explanation for your AC not turning on is a thermostat issue. Make sure your thermostat is on, set to “cool,” and that the temperature is set to a few degrees cooler than the normal ambient temperature of your home. You may also need to replace the batteries. If that doesn’t solve the issue, the temperature sensor in the thermostat may be inaccurate. A thermostat that can’t read the desired temperature could keep your air conditioner from turning on. Once you’ve discovered that the thermostat is broken, it’s time to replace it. If you can’t decide on a thermostat that’s right for your residence, consult with an Expert to help determine the best choice

2) Check the Air Filter 

Your air filter should be exchanged every 30-60 days at minimum. You should change them more frequently depending on the number of pets and people living in your home, and the local air pollution levels near your residence. A dirty air filter can restrict airflow, causing your air conditioner to freeze and not turn on. 

If your air filter looks dirty or you can’t remember the last time you changed it, it’s time to get a new one. If your AC was frozen, wait for it to thaw after changing the filter before turning it back on. 

3) Check the Circuit Breaker 

Open the electrical panel inside your home and attempt to see if the circuit breaker connected to your air conditioner is tripped. You can identify if the breaker is tripped if the switch has shifted to the “OFF” position. To resolve this issue, simply flip the breaker so that it’s in the “ON” position. 

If your AC continues to trip the breaker after resolving this issue, you may have a serious problem and should contact the Experts at Service Experts Heating, Air Conditioning & Plumbing to keep it from damaging your home or air conditioner. 

4) Check the Indoor Shutoff Switch 

Often mistaken for a light switch, if your AC won’t turn on, the indoor shutoff switch may have been flipped unintentionally. These switches are typically placed near your furnace, in a closet, crawl space or attic. Once you locate the shutoff switch, make sure it’s in the “OFF” position. If so, simply turn it back on. It’s always a smart idea to label this switch to stop anyone from mistakenly turning it off. 

5) Check the Outdoor Shutoff Switch 

If you or someone else has recently worked on your air conditioner, they could have turned off the external shutoff switch as a safety precaution. First, identify the external shutoff switch, which should be near your AC unit. If the switch is in the “OFF” position, you’ll need to flip it to allow your air conditioner to turn on. 

6) Identify the AC’s Reset Button 

When your air conditioner won’t turn on, it might simply need to be reset. Not all ACs have a reset button, so first verify if your unit does. If you can find the reset button, press it before going to turn your AC on again. If you can’t find the reset button, manually reset your air conditioner by turning your thermostat off for five to 10 minutes before turning it back on again. 

7) Inspect the AC for Ice Buildup 

Check the air conditioner for any ice buildup either on or inside the unit. If you come across ice on your machine, you need to wait for it to melt before going to start the unit or you risk damaging the AC. Though there are various reasons you could see ice on your air conditioner, it’s always smartest to call Service Experts Heating, Air Conditioning & Plumbing for a consultation to prevent further damage from occurring. 

8) Ensure the Condensate Drain Isn’t Clogged 

If you don’t find ice on the air conditioner, the condensate drain might be backed up. When clogged, your AC won’t turn on as a safety precaution. To resolve the issue, unclog the drain line trying suction from a wet/dry vac. Test that you’ve fixed the blockage by pouring a small amount of clear water and watching it flow out. For severe clogs, it could be best to call the Experts. 

AC Still Won’t Turn On? Call Service Experts Heating, Air Conditioning & Plumbing! 

There’s no reason to suffer without air conditioning—call your local HVAC Experts in the U.S. to help determine why your AC won’t turn on. Our highly trained technicians can diagnose why your unit isn’t working, and complete a repair or install a replacement. And with Service Experts Heating, Air Conditioning & Plumbing, your satisfaction is guaranteed!* 

Contact us at 866-397-3787 to schedule your air conditioning appointment in the U.S. today! 

  • Zoning Systems: Control the Temperature in Every Room

    Central heating and air systems have radically changed home comfort and made it possible to stay completely cozy in any season or climate. But while centralized systems are a handy way to regulate the temperature, they at times fall short when it comes to evenly distributing heated or cooled air... Continue reading

  • Eight Upgrades to Boost Your Home HVAC System

    During the coldest time of the year in the U.S., there’s no better way to improve your home’s comfort than with some effective upgrades. It’s not just about keeping the house toasty warm as the snow begins to fall—it’s about boosting efficiency and improving the very air you breathe.... Continue reading

  • How to Find an Effective HVAC System

    In terms of keeping your home comfortable year-round, nothing is more critical than choosing the right heating, ventilation and air conditioning (HVAC) system. This determination impacts your daily comfort, monthly utility costs and all-around home efficiency. However, with so many system types,... Continue reading