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Rheem Central air conditioner not cooling properly

If your Rheem central air conditioner is not cooling properly, start with the furnace main control board, although it is not a common failure. A faulty board may prevent the condensing unit contactor from receiving 24 volts or keep the blower motor from getting power. Next, check for an airflow problem: a clogged air filter or blower wheel can restrict airflow, cause the evaporator coil to freeze, and leave your central air not cooling or your air conditioner blowing warm air. A defective contactor can also keep the condensing unit from receiving power, while a failed dual run capacitor may make the fan motor noisy, cause it to overheat, or stop it from running. If the coils are clean, airflow is good, and the fan, compressor, and blower motor run but the AC is still not cold, a refrigerant leak or restriction in the sealed system is likely. Finally, a failed relay board can prevent the blower motor from receiving power. Inspect and replace accessible parts only with power disconnected. Contactor and capacitor testing involves 240V, and sealed-system or refrigerant repairs require an EPA 608-certified HVAC technician. Enter your model number to find the exact Rheem replacement part for your central air conditioner.

01 - Rheem 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 - Rheem 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 - Rheem 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 - Rheem 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 Rheem central air conditioner not cooling properly?
Why is my Rheem condenser fan making noise or not running?
What should I check if my Rheem AC condensing unit is not turning on?
Could a sealed system problem cause my central air conditioner to blow warm air?
How do I find the correct Rheem central air conditioner replacement part?

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