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Carrier Central air conditioner not cooling properly

If your Carrier central air conditioner is not cooling properly, start with airflow, the most common cause of central air not cooling or an air conditioner not blowing cold air. A clogged air filter or blower wheel can restrict airflow, cause the evaporator coil to freeze, and leave the AC blowing warm air. Next, inspect the contactor, which sends power to the condensing unit, and the dual run capacitor, which can make the fan motor noisy, cause it to overheat, or keep it from running. If the coils are clean, airflow is strong, and the blower motor, condenser fan, and compressor run but the home AC is still not cooling, a refrigerant leak or restriction in the sealed system may be responsible. A defective relay board can prevent the blower motor from receiving power, while a faulty furnace main control board can stop the contactor from receiving its 24-volt signal. Enter your Carrier model number to find the exact replacement part for your central air conditioner. Air filter and airflow checks are generally DIY-friendly, but contactor, capacitor, relay, control board, and other 240V work require caution and may be best left to a qualified technician. Refrigerant or sealed-system repairs require EPA 608 certification and a licensed HVAC technician.

01 - Carrier Central Air Conditioner Main Control Board

If the central air condensing unit contactor is not receiving 24 volts or power is not getting to the furnace blower motor, a possible cause is a defective furnace main control board. While this is not a common problem, if all other potentially faulty components are working properly, the main control board should be replaced.
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02 - Air Flow Problem

Proper air flow is critical for the central air conditioner to work properly. The evaporator needs proper air flow to keep the condensing water from freezing. If the air filter or blower wheel gets clogged, ice can start forming on the evaporator coils, eventually freezing them up and preventing proper air flow. It is recommended to replace the air filter at least every 6 months or sooner depending on the conditions. Refer to owner's manual for guidance. Avoid covering registers with furniture, rugs, or other items that will restrict the air flow.
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03 - Carrier Central Air Conditioner Contactor

The furnace control board sends a low voltage signal to the contactor. When the contactor receives the signal from the control board, it closes the circuit, sending voltage to the condensing unit components. If the contactor is defective, it will not provide voltage to the condensing unit. To determine if the contactor is at fault, use a multimeter to test the contactor for continuity. If the contactor does not have continuity, replace it.
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Highly Likely

04 - Carrier Central Air Conditioner Dual Run Capacitor

If the dual run capacitor is defective, the fan motor might be noisy, overheat, or not run at all. To determine if the dual run capacitor has failed, inspect the capacitor. If the dual run capacitor is bulging or leaking, replace it.
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Highly Likely

05 - Sealed System Problem

If the unit has good air flow, the evaporator and condensing unit coils are clean, the fan and compressor are running, and the furnace blower is on, but there is still not enough cooling, it is likely there is a leak or restriction in the sealed system. Since diagnosing and repairing a sealed system takes specialized tools and knowledge, a qualified service technician should diagnosis and repair the unit.
Highly Likely

06 - Carrier Central Air Conditioner Relay Board

A relay board is often used to control components of an a central air condidtioner. If the blower motor is not receiving power, the relay board is likely the cause. A defective relay board will need to be replaced.
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Common

Frequently Asked Questions

Why is my Carrier central air conditioner not cooling properly?
Why is my AC condenser not turning on?
Why is my condenser fan making noise or not spinning?
What should I do if my central AC still is not cooling after the airflow checks?
How do I find the correct Carrier AC replacement part?

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