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GrandAire Central air conditioner not cooling properly

If your GrandAire central air conditioner is not cooling properly, start with airflow, the most likely cause. A clogged air filter or blower wheel can restrict airflow, cause the evaporator coil to freeze, and leave your home with an air conditioner not blowing cold air. Replace the filter as recommended and make sure registers are open and unobstructed. Next, a defective contactor can keep the condensing unit from receiving power, while a failed dual run capacitor can make the condenser fan motor noisy, overheated, or unable to run. If the airflow is good and the evaporator and condenser coils, blower motor, fan, and compressor are operating, a refrigerant leak or restriction in the sealed system may be causing central air not cooling. A relay board, or less commonly the furnace main control board, can also prevent the blower motor or contactor from receiving power. Inspecting filters and airflow is generally DIY-safe, but testing or replacing components in the outdoor unit involves 240V line voltage and should be handled only if you are qualified. Refrigerant and sealed-system repairs require EPA 608 certification and a licensed HVAC technician. Enter your GrandAire model number to find the exact replacement part for your central air conditioner.

01 - GrandAire 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 - GrandAire 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 - GrandAire 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 - GrandAire 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 GrandAire central air conditioner not cooling?
Can weak airflow cause my central air conditioner to stop blowing cold air?
Why is my GrandAire outdoor AC unit not turning on?
What causes a GrandAire condenser fan to make noise or stop spinning?
How do I identify and buy the correct GrandAire central air conditioner part?

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