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Carrier Air Conditioner Having Cooling Issues? (Here’s How To Fix It)

Carrier Air Conditioner Having Cooling Issues? (Here's How To Fix It)

Are you experiencing a lack of cooling from your Carrier air conditioner? While Carrier units are known for their quality and durability, certain factors can impact their performance. Here is a comprehensive list of potential reasons why your Carrier air conditioner may not be working optimally.

To identify the main problem with your unit, consider checking the following:

Air Filter

Issue: A dirty air filter can obstruct airflow, making it difficult for the air conditioner to cool effectively. It can also lead to ice buildup on the coils, reducing efficiency and potentially damaging the unit in the long run.

Carrier Air Conditioner Having Cooling Issues? Heres How To Fix It

Solution: Changing the air filter regularly is a simple and inexpensive task that homeowners can easily accomplish. By maintaining your air conditioner and replacing the filter as needed, you can ensure efficient cooling for years to come.

Condenser Coils

Issue: Dirty condenser coils can hinder the cooling efficiency of your Carrier air conditioner. These coils are responsible for releasing heat from the refrigerant, but they won’t function properly if covered in dirt and debris.

Solution: To clean the coils, remove them from the unit and brush away any accumulated dirt and debris. A commercial coil cleaning solution may be required for stubborn build-up. Once the coils are clean, securely reattach them before turning the unit back on, allowing your Carrier air conditioner to cool your home effectively.


Issue: The compressor circulates refrigerant throughout the system, enabling the cooling process. If the compressor malfunctions, the refrigerant cannot perform its task, resulting in inadequate cooling.

Solution: Check if the unit is receiving power, as a lack of power can prevent the compressor from running. Inspect the compressor for any signs of damage, and if identified, replace it promptly.

Heat Pump

Issue: Freezing of the heat pump is a common cause of inadequate cooling in Carrier air conditioners. The heat pump transfers heat from inside the home to the outdoor unit. Moisture in the air can cause the coils to freeze, even at relatively mild temperatures.

Solution: Prevent freezing by keeping the area around the outdoor unit clear of debris and protecting it when not in use. If the heat pump freezes, turn off the power and use a hairdryer to thaw it. Additionally, ensure that the thermostat is set correctly.

Evaporator Coil

Carrier Air Conditioner Having Cooling Issues? Heres How To Fix It

Issue: Accumulated dirt and dust on the evaporator coils can impede their heat transfer capabilities, leading to cooling problems.

Solution: Remove the coils from the unit and clean them by brushing off dirt and debris. Use a commercial coil cleaning solution if necessary. Once clean, reinsert the coils and activate the air conditioner.


Issue: Insufficient cooling may be due to an incorrectly set thermostat, which prevents the air conditioner from turning on.

Carrier Air Conditioner Having Cooling Issues? Heres How To Fix It

Solution: Set the thermostat at least five degrees higher than the current room temperature for optimal cooling. Confirm that the thermostat is in the cooling mode rather than the heating mode.

Fan Motor

Issue: A faulty fan motor is a common problem with Carrier air conditioners. If the fan motor stops working, the entire system requires professional inspection to determine the cause, such as a loose wire or blown fuse.

Solution: Check if the unit is powered on and ensure that the fan motor shows no signs of damage. If the motor is damaged, it needs replacement.

Refrigerant Leak

Issue: Insufficient cooling could be caused by a refrigerant leak, preventing the air conditioner from functioning correctly. Signs of a refrigerant leak include ice buildup on the evaporator coils or hissing noises from the unit.

Solution: Contact a professional repair service immediately if you suspect a refrigerant leak. Handling refrigerant leaks improperly can damage the AC unit and pose safety risks.

Main Control Board

Issue: A failing main control board can cause the Carrier air conditioner to stop cooling. This board supplies power to the compressor and fan, and if it malfunctions, these components won’t operate.

Solution: In some cases, you can replace the control board easily. However, in other instances, you may need to replace the entire air conditioner. Consider consulting a professional for assistance.

Temperature Control Board

Issue: The temperature control board regulates the tension in the coils and valves to generate cold air.

Solution: If the temperature control board is faulty, it may need replacement to restore proper unit functionality. While replacing the board is not overly complex, it is advisable to seek professional help.

Temperature Control Thermostat

Issue: A malfunctioning temperature control thermostat can lead to overheating or rapid cooling in the unit, impacting its ability to cool effectively.

Solution: Check the batteries in the thermostat and replace them if needed. Clean the thermostat’s sensors using a cotton swab dipped in rubbing alcohol. If the issue persists, consider replacing the thermostat, which is a relatively simple repair task. A new thermostat will enable your Carrier air conditioner to cool your home efficiently.


Issue: A thermistor is a temperature-sensitive resistor used to measure temperature. If the thermistor is not functioning correctly, it can affect the air conditioner’s performance.

Solution: Test the thermistor for continuity. If there is no continuity, replacing the thermistor may be necessary. However, if continuity is present, the problem may lie with the air conditioner itself.

Run Capacitor

Issue: The capacitor provides an initial surge of power to the compressor, initiating the cooling process. Over time, a damaged or worn-out capacitor can prevent the compressor from starting, resulting in the air conditioner not cooling.

Solution: Measure the voltage across the capacitor terminals; if it is low, the capacitor is not functioning properly. Use a multimeter to check the capacitance; if it is low, the capacitor requires replacement. Additionally, inspect the capacitor for physical damage, such as cracks or leaks, and replace it if damaged.

If Troubleshooting Fails To Restore Cooling, What Should You Do?

If you feel confident in your abilities, you can attempt the troubleshooting tips provided earlier. However, if you are uncertain about the cause of the cooling issue, it is recommended to contact a certified technician for diagnosis and repair. A qualified technician will efficiently identify the problem and perform the necessary repairs.

How Can You Prevent Carrier Air Conditioner Cooling Issues?

Regular maintenance is crucial for preventing cooling problems with your air conditioner. Follow these guidelines:

  1. Keep the unit clean and free of debris.
  2. Regularly check and replace the air filters as needed.
  3. Schedule routine maintenance appointments with a qualified technician.

By adhering to these practices, you can ensure your Carrier air conditioner operates smoothly throughout the summer, providing optimal cooling performance.


If your Carrier air conditioner is not cooling, taking prompt action is essential. Remember, a malfunctioning air conditioner can lead to uncomfortable temperatures and increased energy bills. To maximize the efficiency of your AC unit, keep it clean and well-maintained.

Carrier Air Conditioner Having Cooling Issues? (Here's How To Fix It)

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