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Arcoaire Central air conditioner won't turn off

When an Arcoaire 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 keeps sending a cooling signal through the yellow Y thermostat wire to the control board and contactor, even when the system is set to Off. A defective thermostat may show continuity between the C and Y terminals while off. If the boards and thermostat test good, a shorted contactor may be keeping power supplied to the condenser components. Enter your model number to find the exact replacement control board, thermostat, or contactor for your Arcoaire central air conditioner. Thermostat replacement and low-voltage testing may be reasonable DIY work, but the control board and contactor involve 240V line voltage. Turn off power at the disconnect box and circuit breaker, and have a licensed HVAC technician handle electrical testing or repairs beyond your comfort level.

01 - Arcoaire 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 - Arcoaire 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 - Arcoaire 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 - Arcoaire 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 - Arcoaire 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 Arcoaire central air conditioner turn off?
How can I tell if the thermostat is causing my AC to keep running?
Can a bad AC contactor cause the condenser to run continuously?
Could the Arcoaire furnace control board or main control board be keeping the AC on?
How do I find the correct replacement part for my Arcoaire central air conditioner?

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