Air Conditioner Troubleshooting

Sometimes, when things go wrong with your home air conditioning system, there are a few ways you can try to fix a simple problem on your own. Here are some troubleshooting tips to try before you call us. These are more likely to help you if you already have an idea of what may be the issue.

System Not Cooling

  • You may have a tripped circuit breaker.

Try: Check your home circuit breaker box and reset circuit breaker. If it trips again either right away or after some time, call AC Express at (512) 866-5520, for a service call right away.

  • Your thermostat/control may be off or set incorrectly.

Try: Check to make sure your thermostat/control is on and set to cool. Reset to your desired temperature.

  • Your indoor unit is running but the outdoor unit is not.

Try: Air coming through your vent will be warm. Check the settings on the thermostat. Is the set to temperature lower than the inside temperature? If no, lower the set temperature, if yes, contact us as soon as possible for a service call.

  • Your thermostat may be off or set incorrectly.

Try: Make sure your thermostat is on and set to cool. If the thermostat is on, reset the thermostat to your desired temperature.


No Airflow

  • You may have dirty filters.

Try: Check the filters in each of your system’s components. Clean or replace filters as recommended in your use and care guide.

  • Your system may have frozen up due to a variety of causes.

Try: Check for signs of water below unit, cold exterior surface of indoor coil enclosure, and ice formation on the refrigerant lines just on the outside of the indoor coil. Turn your thermostat off and Fan to the On position, let it run for 1 to 3 hours to see if it will defrost.


Unusually high utility bills.

  • If your system is reaching its set point, is it working correctly? Have your local temperatures been extreme lately?

Try: Check the following: Is your system cycling constantly? Is your thermostat reaching its set value? Do you have any new appliances (e.g., a hot tub or pool heater) that use lots of power? Have you checked to see if your local utility company had a recent rate increase? Are your bills based on estimated reads or actual?

System constantly running

  • Your system could be trying to reach a set point that is too extreme.

Try: Check the set point on your thermostat. Is it set to more than 15F below the outdoor temperature? If so, raise the thermostat set point as Air Conditioning systems are typically designed to cool to 15F below the Outdoor temperature. If this is not why your system is running constantly, contact us as soon as possible to diagnose your unit.

If you're in need of repairs or maintenance for your home air conditioning system, call AC Express right away! Our certified technicians can respond same-day. Call now! (512) 866-5520