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HomeRepair HelpGarrison Central A/C RepairGarrison Central air conditioner won't turn off Repair

Garrison Central air conditioner won't turn off

When a Garrison 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 signal through the thermostat wire to the control board and contactor, making the AC keep running even when the system is set to Off. With power safely disconnected, a qualified DIYer can use a multimeter to check for continuity between the thermostat's common, or C, and yellow, or Y, terminals while the thermostat is off. Continuity indicates a defective thermostat. A shorted contactor is another possible cause of an air conditioner running constantly, but testing or replacing it involves line voltage in the outdoor unit. Turn off the disconnect box and circuit breaker, and hire a qualified technician if you are not trained to work around 240-volt wiring. Enter your Garrison model number to find the exact replacement control board, thermostat, wall thermostat, or contactor for your central air conditioner.

01 - Garrison 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 - Garrison 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 - Garrison 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 - Garrison 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 - Garrison 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 Garrison central air conditioner turn off?
How do I test a thermostat that keeps my central air running?
Can a stuck contactor cause my AC to run constantly?
Should I replace the Garrison control board if my air conditioner won't shut off?
How do I find the correct Garrison replacement part for an AC that won't turn off?

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