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How To Troubleshoot Most Central AC Problems

Updated: May 16, 2023

We see it all the time: A frustrated homeowner calls Sons of Air Cooling and Heating to fix an AC problem—a problem they could easily have fixed themselves!

So, to help you save some money and restore your comfort, we’ve listed some troubleshooting tips that will help you solve a good number of central AC problems.

Try the following DIY AC troubleshooting tips the next time you’re having AC issues:

  • Check for a dirty air filter

  • Check your thermostat settings

  • Check your air conditioner circuit breakers

  • Check your outdoor unit

  • Check all air vents

We’ll show you specifically what to do and explain the specific AC problems you can solve by checking the items above.

Check For A Dirty Air Filter

AC problems caused by a dirty filter:

  • Low airflow from air vents

  • Ice on refrigerant lines

  • Frozen evaporator coil

  • Water leaking from your AC

  • Inadequate cooling (hot/cold spots, AC struggles to reach set temperature)

  • Higher-than-normal energy bills

  • Equipment failure

What to do: Take a look at your air filter. Replace your filter if it’s dirty or clogged (like the filter to the right).

Check Thermostat Settings

AC problems caused by wrong thermostat settings:

  • Warm or hot air coming from air vents

  • AC won’t turn on

What to do: Go to your thermostat and check to make sure it’s set to COOL not HEAT.

We’ve made many service calls to repair an AC that “isn’t working” just to find that they had forgotten to move the thermostat from HEAT to COOL. It happens a lot, especially when we switch from heating to cooling season.

Check Air Conditioner Circuit Breakers

AC problems caused by tripped breaker:

  • AC won’t turn on

What to do: Go to your home’s main electrical panel and check for circuit breakers that aren’t in the ON position. If your circuit breakers are clearly labeled, look specifically for one labeled “air conditioner” or “AC”.

If your AC circuit breakers are tripped, push the breakers firmly into the ON position and try running your AC again.

Note: If the breaker immediately trips once the AC runs, don’t try flipping the circuit breaker again. You’ll need to have Sons of Air Cooling and Heating look at the unit as this is a sign of a larger electrical problem.

Check Outdoor Unit

AC problems caused by a dirty outdoor unit:

  • Higher-than-normal energy bills

  • Warm air coming from air vents

  • AC doesn’t provide adequate cooling

  • Frequent repairs

What to do: Go outside and take a look at your outside AC unit (condenser). If you see a layer of dirt on the outside of the unit, use a hose on a gentle setting to remove the dirt.

Even leaves or branches stuck in the condenser coils can cause serious AC problems.

Note: Also keep an eye out for foliage or fences that are within 2 feet from your outdoor unit. Move any surrounding objects at least 2 to 3 feet from your condenser.

Check Air Vents

AC problems caused by closed/blocked air vents:

  • AC struggles to cool your home

  • Ice on refrigerant lines

  • Frozen evaporator coil

  • Water leaking from your AC

  • Damaged compressor

  • Blower motor problems

  • Increased duct leakage (higher AC bills)

What to do: Walk throughout your home and make sure that all supply vents (both return and supply) are open and unblocked—even the ones in unused rooms.

Rugs, drapes or furniture can easily block both return vents (vents that suck air in, see picture below) and supply vents (vents that blow air out) so keep an eye out for blocked air vents throughout your home.

AC return vent.

Many homeowners also purposefully close supply vents in rooms that aren’t being used because they think they will save money on energy bills. But really, all that does is increase energy bills and cause other AC and ductwork problems.

AC supply vent.

Call An AC Repair Expert in San Antonio.

If you're having issues of any kind with your air conditioning system and you're in the San Antonio area, give Sons of Air Cooling and Heating a call. We have been repairing air conditioners since 2003 and serve San Antonio and all of the surrounding areas.

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