Common Air Conditioner Problems | St. Louis HVAC Tips

When summer temperatures rise, a malfunctioning air conditioner can be frustrating and uncomfortable. Understanding common air conditioner problems can help you diagnose issues quickly and determine whether you can fix them yourself or need professional assistance. In this guide, we’ll cover ten of the most frequent AC problems and how to troubleshoot them effectively.

If you need expert air conditioner repair services in St. Louis, contact Galmiche & Sons for fast and reliable service.

What Are the Common Air Conditioner Problems to Look Out For?

Watching out for common air conditioner problems and signs you need AC repair can help keep your air conditioner in working order and prevent costly AC repairs. If you notice any of the following AC problems, follow the troubleshooting steps below to help diagnose the issue. For more help, contact our HVAC professionals to schedule repair service.

1. AC Won’t Turn On

If your air conditioner doesn’t start, check the thermostat settings first. Ensure it’s set to “cool” and the temperature is lower than the room’s current temperature. Also, inspect the circuit breaker to see if it has tripped. If the breaker is fine and the thermostat is functioning correctly but your AC won’t turn on, the issue may be with the compressor or wiring, requiring professional repair.

2. Weak Airflow

Poor airflow can result from clogged air filters, blocked vents, or a failing blower motor. Start by replacing the air filter, which should be done every 1-3 months. Also, ensure that all vents are open and unobstructed. If airflow remains weak, the blower motor or ductwork may require inspection. Contact our team for professional air conditioner airflow repair and troubleshooting.

3. Warm Air Coming from Vents

If your AC is blowing warm air, this is one of the most common air conditioner problems. To remedy this issue, first check that the thermostat is set correctly. Next, inspect the air filter, as a clogged filter can restrict cooling efficiency. Another possible cause is a refrigerant leak, which must be repaired by an HVAC professional.

4. Refrigerant Leaks

Low refrigerant levels indicate a leak in the system, not just a need for a recharge. Symptoms include hissing sounds, ice buildup on coils, and inefficient cooling. Since handling refrigerants requires certification, it’s best to contact a professional to locate and repair leaks.

5. Frozen Evaporator Coils

Evaporator coils can freeze due to dirty filters, low refrigerant levels, or airflow blockages. Turn off the system to allow the coils to thaw. Afterward, replace the air filter and ensure vents are open. If freezing persists, there may be an underlying refrigerant or airflow issue.

6. AC Constantly Cycling On and Off

Frequent cycling can be caused by a dirty air filter, an oversized AC unit, or a faulty thermostat sensor. Replace the filter and check if the thermostat is positioned correctly. If the problem persists, a technician may need to inspect the sensor or system settings.

7. Strange Noises from the AC Unit

Do you find yourself wondering “Why is my air conditioner so loud?” Unusual sounds like banging, buzzing, or squealing often indicate mechanical issues. Loose components, a failing motor, or a damaged fan blade may be responsible. Turn off the system and inspect for visible issues. If noises persist, a technician should assess the system.

8. AC Leaking Water

If you notice water pooling around your AC, a clogged condensate drain may be the issue. Try flushing the drain line with a mixture of vinegar and water. A damaged drain pan or frozen coils could also cause leaks, requiring professional repair.

9. Bad Odors Coming from Vents

Foul odors may result from mold in the ducts, a dirty air filter, or stagnant water in the drain pan. Replace the filter, clean the condensate drain line, and schedule duct cleaning if odors persist.

10. AC Trips the Circuit Breaker

If your AC repeatedly trips the breaker, it could be due to adirty air filter, electrical issues, or a failing compressor. Start by replacing the filter and ensuring the unit is clean. If the issue continues, an HVAC technician should inspect the system for electrical faults.

Common Air Conditioner Problem FAQs

How often should I replace my AC filter?

Filters should be changed every 1-3 months, depending on usage and indoor air quality.

Why is my AC making a buzzing noise?

A buzzing sound could indicate electrical issues, a failing capacitor, or loose parts inside the unit. Have an HVAC technician inspect it.

Can I add refrigerant to my AC myself?

No. Refrigerant handling requires certification, and leaks should be professionally repaired before recharging the system.

Need AC Repairs in St. Louis? Contact Galmiche & Sons Today!

If you’re experiencing any of these common air conditioner problems, our expert technicians at Galmiche & Sons can help. Whether you need a simple repair, maintenance, or a full system replacement, we provide trusted HVAC services in St. Louis. Contact our heating and air conditioning experts today to schedule an appointment and keep your home cool all summer long!