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Luxaire Central air conditioner not cooling properly

When a Luxaire central air conditioner is not cooling properly, the main control board is a possible cause when the condensing unit contactor is not receiving 24 volts or the furnace blower motor is not getting power, although this is not common. Next, check for an airflow problem: a clogged air filter or blower wheel can restrict air, freeze the evaporator coil, and leave your central air not cooling or your air conditioner blowing warm air. A defective contactor can prevent voltage from reaching the outdoor condensing unit. A failed dual run capacitor may make the condenser fan motor noisy, cause it to overheat, or keep it from running. If the blower motor still has no power, the relay board may be defective. When airflow is good, the coils are clean, and the blower, fan, and compressor run but the AC is not cold, a refrigerant leak or restriction in the sealed system is likely. Enter your Luxaire model number to find the exact replacement part for your specific central air conditioner. You can replace filters and inspect airflow yourself, but contactor, capacitor, control-board, and other 240V work can be dangerous; refrigerant or sealed-system repairs require an EPA 608-certified HVAC technician.

01 - Luxaire 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 - Luxaire 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 - Luxaire 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 - Luxaire 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 Luxaire central air conditioner not cooling or blowing enough air?
Why is my Luxaire AC condenser not turning on?
What causes a Luxaire condenser fan to make noise or stop spinning?
Why is my Luxaire central air conditioner still not cooling after I clean the coils and replace the filter?
How do I find the correct replacement part for my Luxaire central air conditioner?

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