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Kelvinator Central air conditioner not cooling properly

If your Kelvinator central air conditioner is not cooling properly, start with an airflow problem. A clogged air filter or blower wheel can restrict air through the evaporator coil, cause the coil to freeze, and leave your central air not cooling or blowing warm air. Replace the filter as recommended and keep supply registers clear. Next, check the contactor, which sends power to the outdoor condensing unit when it receives a low-voltage signal from the furnace control board. A failed dual run capacitor can also make the condenser fan motor noisy, overheat, or stop running, preventing the AC unit from cooling. If the evaporator and condenser coils are clean, airflow is good, and the blower motor, 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 or main control board is less common but can stop the blower motor or contactor from receiving power. Turn off power before inspecting parts, and do not work inside the 240-volt condensing unit unless qualified. Refrigerant diagnosis or repair requires EPA 608 certification and a licensed HVAC technician. Enter your model number to find the exact replacement part for your Kelvinator central air conditioner.

01 - Kelvinator 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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Top Solution

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 - Kelvinator 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 - Kelvinator 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 - Kelvinator 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 Kelvinator central air conditioner not cooling properly?
Why is my Kelvinator AC blowing warm air when the outdoor unit is not running?
What causes a condenser fan motor to make noise or stop spinning?
Could a sealed system problem cause my central air conditioner not to cool?
How do I find the correct Kelvinator central air conditioner replacement part?

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