Guide to Diagnosing Common AC Problems in Single-Family Homes


Is the AC in your single-family home not performing as it should? Before calling for maintenance, you might be able to identify or even resolve the issue yourself. This guide, based on expert advice from HomeTips, aims to help you understand common AC problems and their possible solutions.

AC Not Working At All

  • Check Power Supply: Make sure the AC unit is plugged in and the circuit breaker hasn't tripped.
  • Reset Switches: Locate the equipment’s switches and/or overloads and reset them.
  • Thermostat Settings: Ensure the thermostat is set to "Cool" and the temperature is set lower than the current room temperature.

AC Not Cooling But Running

  • Turn Off Power: Always turn off the power to the AC unit before inspecting it.
  • Air Filter: A dirty air filter can block airflow. Consider cleaning or replacing it.
  • Check for Ice: If you see ice on the coils, turn the power and fan back on to melt it.

Air Conditioner Not Blowing Air

  • Check Air Filters: A clogged air filter can restrict airflow. Clean or replace as needed.
  • Check Registers: Make sure the air registers are open and not blocked by furniture or curtains.

Water Leaking from AC

  • Check Condensate Drain: The AC unit removes moisture from the air, which can lead to water leakage if the drain is clogged.

Air Conditioner Makes Noise

  • Identify the Noise: Different noises can indicate various issues. A buzzing noise might indicate electrical problems, while a rattling noise could mean loose parts.

Air Conditioner Won’t Turn Off

  • Check Thermostat: Double-check the thermostat settings. If it's set correctly and the AC still won't turn off, you may need professional help.

Additional Tips

  • Seasonal Maintenance: It's a good idea to clean or replace air filters at least twice a year.
  • Professional Help: Some issues, like electrical problems or refrigerant leaks, should only be handled by professionals.


Understanding these common AC problems can help you resolve minor issues yourself, saving you time and potentially reducing the need for professional repairs.

Note: This information is not exhaustive. For a more detailed guide, you can visit the original article.

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