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Medallion Central air conditioner not cooling properly

If your Medallion central air conditioner is not cooling properly, start with the main control board, which can prevent the condensing unit contactor from receiving 24 volts or keep the furnace blower motor from getting power, although this is not a common failure. Next, check for an airflow problem caused by a clogged air filter, blocked registers, or dirty blower wheel. Restricted airflow can freeze the evaporator coil and leave the central air conditioner not cooling or the air conditioner blowing warm air. A defective contactor may also keep the outdoor unit from receiving power, while a failed dual run capacitor can make the fan motor noisy, overheat, or stop running. If airflow is good and the coils, blower, fan, and compressor operate but the AC is still not cold, a refrigerant leak or restriction in the sealed system is likely. A faulty relay board can also stop the blower motor. Turn off power before inspecting accessible parts, and leave 240V testing, capacitors, contactors, and control-board work to a qualified technician. Refrigerant and sealed-system repairs require EPA 608 certification. Enter your Medallion model number to find the exact replacement part for your central air conditioner.

01 - Medallion 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 - Medallion 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 - Medallion 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 - Medallion 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 Medallion central air conditioner not cooling properly?
What should I check if the condenser fan is not spinning or is making noise?
Why is my Medallion AC condensing unit not turning on?
What causes a central air conditioner to keep blowing warm air after the airflow is fixed?
How do I find the correct replacement part for my Medallion central air conditioner?

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