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Gibson Central air conditioner not cooling properly

If your Gibson central air conditioner is not cooling properly, start with the most likely cause: an airflow problem. A clogged air filter or blower wheel can restrict air over the evaporator coil, causing ice to form and leaving your central air not cooling or your air conditioner blowing warm air. Replace the filter as recommended and make sure registers are open and unobstructed. Next, check the condensing unit contactor, which receives a low-voltage signal from the furnace control board and sends power to the outdoor unit. A failed dual run capacitor can also make the condenser fan motor noisy, overheat, or stop running. If airflow is good, the evaporator and condenser coils are clean, and the blower motor, condenser fan, and compressor run but the home AC is not cooling, suspect a refrigerant leak or restriction in the sealed system. A relay board or, less commonly, the Gibson main control board may prevent the blower or contactor from receiving power. Turn off power before inspecting parts. Contactor and capacitor testing involves hazardous 240V electricity, so use a qualified technician if you are not trained. Refrigerant repairs require EPA 608 certification. Enter your model number to find the exact replacement part for your Gibson central air conditioner.

01 - Gibson 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.
Top Solution

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

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