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Maytag Central air conditioner won't turn off

When your Maytag 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. A shorted control board can continuously send voltage to the condensing unit, keeping the compressor and condenser fan running even when the thermostat is set to off. The main control board can cause the same problem and should be inspected for visible damage. Next, check the Maytag wall thermostat or thermostat wiring. A stuck contact between the common (C) and yellow (Y) thermostat wire terminals can keep signaling the contactor to run. If the thermostat shows continuity between C and Y while off, replace it. A shorted contactor is less common but can also keep the outdoor unit energized after the control signal stops. This condition is often described as an air conditioner that won't turn off, an AC that won't shut off, or a central air conditioner running constantly. Enter your Maytag model number to find the exact replacement control board, thermostat, wall thermostat, or contactor for your system. Disconnect power before inspection. Testing or replacing a contactor involves 240V line voltage and is beyond safe DIY work, so have a qualified HVAC technician handle it.

01 - Maytag 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 - Maytag 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 - Maytag 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 - Maytag 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 - Maytag 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 Maytag central air conditioner turn off?
How do I know if my AC thermostat is causing the central air to keep running?
Can a bad AC contactor make the outdoor unit keep running?
Could a control board cause my central air conditioner not to turn off?
How do I find the correct Maytag AC thermostat, contactor, or control board replacement part?

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