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Haier Central air conditioner won't turn off

Won’t your Haier air conditioner turn off? The system may be receiving a continuous cooling signal even when the thermostat is set to Off. The most likely cause is a failed furnace control board with a short that keeps sending voltage to the outdoor condensing unit. A shorted main control board can cause the same symptom. Next, check the wall thermostat or thermostat wiring: stuck electrical contacts between the common "C" and yellow "Y" thermostat wire terminals can keep the contactor energized, making the central air run continuously. A shorted contactor is another possibility, although it is less common. This troubleshooting applies when the central air won't turn off, the air conditioner won't shut off, or the AC keeps running. Inspect the control board and thermostat for visible damage, and have a qualified HVAC technician test or replace the contactor and handle 240V line-voltage components. Enter your Haier model number to find the exact replacement control board, thermostat, or contactor for your central air conditioner. Replacing parts inside the sealed refrigerant system is not a DIY repair and requires an EPA 608-certified technician.

01 - Haier Central Air Conditioner Control Board

If the furnace control board has a short, it may be providing continuous voltage to the central air condensing unit preventing it from turning off. Inspect the control board for any damage and replace if necessary.
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Common

02 - Haier Central Air Conditioner Main Control Board

If the furnace's main control board has a short, it may be providing continuous voltage to the central air condensing unit preventing it from turning off. Inspect the control board for any damage and replace if necessary.
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Common

03 - Haier Central Air Conditioner Wall Thermostat

The wall thermostat has electrical contacts that send signal voltage back to the control board and the condensing unit's contactor to run the central air system. If the contact that controls the contactor sticks closed, it will send continuous voltage to the contactor, causing the central air system to run continuously. To determine if the thermostat is defective, use a multi-meter to test it for continuity. If the wall thermostat shows continuity between the common (“C”) and yellow (“Y”) thermostat wire terminals when the thermostat is in the off position, the thermostat has failed and will need to be replaced.
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Common

04 - Haier Central Air Conditioner Wifi Thermostat

The WiFi thermostat has electrical contacts that send signal voltage back to the control board and the condensing unit's contactor to run the central air system. If the contact that controls the contactor sticks closed, it will send continuous voltage to the contactor, causing the central air system to run continuously. To determine if the thermostat is defective, use a multi-meter to test it for continuity. If the WiFi thermostat shows continuity between the common (“C”) and yellow (“Y”) thermostat wire terminals when the thermostat is in the off position, the thermostat has failed and will need to be replaced.
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Common

05 - Haier 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 has shorted, it can send continuous voltage to the condensing unit's components resulting in the central air system not turning off. To determine if the contactor is at fault, use a multimeter to test the contactor for a short. If the contactor has shorted, replace it.
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Less Common

Frequently Asked Questions

Why won't my Haier central air conditioner turn off?
How do I test a Haier thermostat that won't shut off the air conditioner?
Can a bad contactor cause my air conditioner to run constantly?
Could the Haier furnace control board or main control board be causing the AC not to turn off?
How do I find the correct Haier central air conditioner replacement part?

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