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Goodman Central air conditioner won't turn off

If your Goodman 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 defective wall thermostat or thermostat wiring is another common cause. If its contacts stick closed, the thermostat continues sending a signal through the yellow Y thermostat wire to the contactor, even when set to Off. A shorted contactor can also keep the Goodman AC stuck on by continuously powering the condensing unit. You can inspect the thermostat and control board for visible damage, and a qualified DIYer can test thermostat continuity with a multimeter, but shut off power at the disconnect box and circuit breaker before inspecting components. Testing or replacing parts inside the 240-volt condensing unit requires electrical skill and may be beyond DIY scope. Enter your Goodman model number to find the exact replacement control board, thermostat, wall thermostat, or contactor for your central air conditioner.

01 - Goodman 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 - Goodman 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 - Goodman 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 - Goodman 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 - Goodman 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 Goodman central air conditioner turn off?
How do I test a Goodman thermostat that is not turning off the AC?
Could a Goodman AC contactor cause the condensing unit to keep running?
Should I replace the Goodman control board if my air conditioner won't shut off?
How do I find the correct Goodman replacement part for an AC that keeps running?

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