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HomeRepair HelpYork Central A/C RepairYork Central air conditioner won't turn off Repair

York Central air conditioner won't turn off

If your York central air 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. A stuck contact between the common "C" and yellow "Y" thermostat wire terminals can keep signaling the condensing unit's contactor even when the thermostat is set to off. A qualified DIYer can test the thermostat for continuity with a multimeter, but replace it if continuity remains when it should be open. A shorted contactor is less common and can continuously power the condenser components. Because the contactor and control board involve electrical circuits, shut off power before inspection, and have a licensed HVAC technician handle any 240V line-voltage testing or repair. Refrigerant service is not indicated for this symptom, but any sealed-system work requires EPA 608 certification. Enter your York model number to find the exact replacement control board, thermostat, wall thermostat, or contactor for your central air conditioner.

01 - York 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 - York 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 - York 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 - York 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 - York 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 York central air conditioner turn off?
How do I test a York thermostat that will not shut off the AC?
Can a bad AC contactor cause the central air conditioner to run constantly?
Could the York furnace control board or main control board be keeping the AC on?
How do I find the correct York AC replacement part?

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