Is your AC running but not cooling your home? A malfunctioning air conditioner is a frustrating issue, especially during the hot Phoenix summers. When your system stops working without explanation, it can make your home uncomfortable and cause a major inconvenience. Explore the most common causes of this AC problem and how the team at 1st Choice Mechanical can help Greater Phoenix area homeowners cool down again.
Thermostat Issues
The thermostat is the first thing to check if you notice your AC is on but not cooling. In many cases, this issue is caused by incorrect settings or a faulty thermostat.
Incorrect settings
Before jumping straight to DIY repairs, check the thermostat settings. Ensure the thermostat is set to “cool” and the target temperature is correct. Double-check that the thermostat isn’t switched off, set to heat, or set to constant fan.
Faulty thermostat
Loose or damaged wiring in your thermostat can cause your air conditioner to behave unusually. There may be an issue with the thermometer, which means the thermostat can’t tell what temperature it really is inside the house. The thermostat might also be having power issues, causing the air conditioner to operate sporadically or not at all.
If you suspect a faulty thermostat, contact an AC repair professional rather than attempt to fix it yourself.
Poor Airflow
It’s possible that your air conditioner is cooling air as it should, but the air can’t enter your home due to blocked air ducts or a clogged air filter.
Blocked air vents
If you notice vents that have little or no air blowing when the air conditioner is running, there may be a blockage. Dust, dirt, pet hair, and other debris can build up in air vents over time, stopping cool air from entering your home. An AC maintenance expert can diagnose vent blockages and thoroughly clean all ducts to ensure even airflow throughout the home.
Dirty air filters
Replace air filters regularly every one to three months, depending on the filter type and how often the system is used. When the filters get too dirty, air won’t be able to pass through, causing the frustrating problem of your AC working but not cooling.
Refrigerant Issues
Refrigerant is a chemical that flows through the air conditioner coils, cooling your home. In the past, ozone-depleting CFC refrigerants were used, but they‘ve since been replaced by safer alternatives. However, even modern refrigerants can cause issues with your air conditioner.
Low refrigerant levels
Damage to your AC’s condenser coils and other components may cause a refrigerant leak. Without the correct amount of refrigerant, your unit can’t properly control your home’s climate. An AC repair pro will assess refrigerant levels and add more if they’re too low.
Refrigerant leaks
In a properly-running air conditioner, you shouldn’t need to refill refrigerant. Your HVAC works as a closed-loop system, infinitely cycling refrigerant. However, refrigerant leaks can sometimes occur, causing this cooling chemical to escape the system and ultimately affect your air conditioner’s performance. A repair tech will examine the air conditioner’s coils for damage, repair or replace as needed, and refill the refrigerant.
Condenser Unit Problems
Most air conditioners include an outdoor condenser unit. This component has a large coil wrapped around the outside, which is used to pull heat energy out of your home with the help of the condenser fan. Problems with these components are often the cause of AC cooling issues.
Dirty condenser coils
Your condenser coil features a series of thin, metal fins on the outside of the unit. These units are typically outdoors, so it’s not uncommon for the narrow spaces between each fin to become dirty or clogged with dust, debris, and other particulates. Our HVAC techs can clean AC coils and get the system up and running again.
Faulty condenser fan
The condenser fan is powered by a motor, which can break down. You’ll know you’re dealing with a condenser fan motor issue if you notice unusual noises from the unit, slow fan speeds, or overheating of the unit itself. This complex electrical repair is best left to a HVAC professional.
Electrical Issues
If none of the above causes seem to be the answer for your AC running but not cooling, the electricals could be the culprit. Typically, cooling issues are caused by faulty capacitors or wiring problems.
Faulty capacitors
Your AC’s capacitor is responsible for charging and starting your AC motor. Old capacitors often break down over time, leading to reduced energy efficiency and issues with performance. A capacitor should last up to 20 years with regular maintenance, but power surges and high temperatures may weaken it and cause it to malfunction sooner. If you suspect the capacitor is the problem with your air conditioning, contact a professional for repair.
Wiring problems
There are many wiring connections in the average air conditioner, and age, wear and tear, power surges, and improper installation all have the potential to damage them. Working with wiring is dangerous for inexperienced people, so contact a HVAC repair expert for help.
Need Help Diagnosing an Issue With Your Home’s AC Unit?
There are many possible reasons for an air conditioner running but not cooling. The 1st Choice Mechanical team is prepared to assist you with a comprehensive range of HVAC services so your family can enjoy cool comfort even on the hottest summer days. Contact us to learn why we’re a top HVAC contractor in the greater Phoenix area.