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ICP Central air conditioner not cooling properly

When an Icp central air conditioner is not cooling properly, start with airflow, the most likely cause. A clogged air filter or blower wheel can restrict air across the evaporator coil, causing it to freeze and leaving your central air not cooling or blowing warm air. Replace the air filter, keep registers clear, and inspect the blower wheel. Next, check the ICP contactor, which sends power to the condensing unit, followed by the dual run capacitor. A failed 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, fan, and compressor run but the AC is still not cold, a refrigerant leak or restriction in the sealed system may be responsible. A defective relay board or furnace main control board is less common but can prevent the blower motor or contactor from receiving power. Turn off power before inspecting parts, and leave 240V testing or repairs to a qualified technician. Refrigerant and any sealed-system repair require EPA 608 certification and a licensed HVAC technician. Enter your ICP model number to find the exact replacement air filter, capacitor, contactor, relay board, or control board for your central air conditioner.

01 - ICP 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 - ICP 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 - ICP 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 - ICP 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 ICP central air conditioner not cooling or blowing cold air?
Why is my ICP outdoor AC unit not turning on?
What causes the condenser fan to make noise or stop spinning?
What should I do if my AC has good airflow but still is not cooling?
How do I find the correct ICP central air conditioner replacement part?

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