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Nordyne Central air conditioner won't turn off

When a Nordyne central air conditioner won't turn off, a shorted contactor or a bad wall thermostat or thermostat wiring is the most likely cause, keeping a cooling signal on the yellow (Y) terminal even after the thermostat is set to Off. A shorted furnace control board or main control board can cause the same problem, though it is a less common cause, by continuing to send voltage to the outdoor condensing unit and making the air conditioner run constantly. Next, check the wall thermostat or thermostat wiring. If its contacts stick closed, the thermostat can continue sending a signal through the yellow Y thermostat wire to the contactor, causing the air conditioner to run constantly even when the thermostat is set to off. A shorted contactor is less common but can also keep the AC on by supplying continuous power to the condenser components. You can inspect the control board and test the thermostat for continuity with a multimeter, but shut off power first and follow electrical safety procedures. The contactor and control boards involve hazardous voltage, so have a licensed HVAC technician handle repairs inside the condensing unit or any 240V wiring. Enter your Nordyne model number to find the exact replacement control board, thermostat, wall thermostat, or contactor for your central air conditioner.

01 - Nordyne 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 - Nordyne 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 - Nordyne 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 - Nordyne 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 - Nordyne 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 Nordyne central air conditioner turn off?
How can I tell if the thermostat is causing my AC to run constantly?
Could a stuck contactor keep my Nordyne AC from shutting off?
What should I do if my central air conditioner will not turn off safely?
How do I find the correct Nordyne AC thermostat, contactor, or control board replacement part?

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