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Tempstar Central air conditioner not cooling properly

Is your Tempstar central air conditioner not cooling properly? The main control board may not be sending 24 volts to the condensing unit contactor or power to the furnace blower motor. More often, an airflow problem is behind a central air conditioner not cooling: a clogged air filter or blower wheel can restrict airflow, freeze the evaporator coil, and leave the air conditioner blowing warm air. A defective contactor can keep the outdoor unit from receiving power, while a failed dual run capacitor can cause the condenser fan motor to run noisily, overheat, or stop. If airflow is good and the evaporator coil, condenser coil, fan, compressor, and blower motor are operating, a refrigerant leak or restriction in the sealed system may be responsible. A relay board can also prevent the blower motor from running. Replace accessible filters and inspect for obvious airflow restrictions, but contactor, capacitor, control board, and other 240-volt components require qualified HVAC service. Refrigerant diagnosis or repair requires EPA 608 certification and a licensed technician. Enter your Tempstar model number to find the exact replacement part for your central air conditioner.

01 - Tempstar 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 - Tempstar 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 - Tempstar 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 - Tempstar 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 Tempstar central air conditioner not cooling?
What should I check if my Tempstar air conditioner is not blowing cold air or has weak airflow?
Why is my Tempstar condenser fan not running, and could the dual run capacitor be bad?
What should I check if my Tempstar outdoor AC unit is not turning on?
How do I find the correct Tempstar replacement part for a central air conditioner that is not cooling?

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