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Nutone Central air conditioner not cooling properly

If your NuTone central air conditioner is not cooling properly, start by checking for an airflow problem, the most common cause of central air not cooling or an air conditioner not blowing cold air. A clogged air filter or blower wheel can reduce airflow, cause the evaporator coil to freeze, and leave the AC unit blowing warm air. Next, a failed contactor can prevent the condensing unit from receiving power, while a defective dual run capacitor can 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 motor, and compressor run but cooling remains weak, the sealed system may have a refrigerant leak or restriction. Refrigerant diagnosis and any repair inside the sealed system require EPA 608 certification and a licensed HVAC technician. A faulty relay board or NuTone main control board can also stop the blower motor or prevent the contactor from receiving its 24-volt signal, though the main control board is less common. Disconnect power before inspecting accessible parts, and leave 240-volt testing or repairs to a qualified technician. Enter your model number to find the exact replacement part for your NuTone central air conditioner.

01 - Nutone 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 - Nutone 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 - Nutone 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 - Nutone 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 NuTone central air conditioner not cooling or blowing enough air?
What should I check if the NuTone condenser fan is not running or is making noise?
Why won't my NuTone central air conditioner turn on?
What if my NuTone air conditioner still is not cooling after airflow and electrical checks?
How do I find the correct replacement part for my NuTone central air conditioner?
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