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HomeRepair HelpFrigidaire Central A/C RepairFrigidaire Central air conditioner won't turn off Repair

Frigidaire Central air conditioner won't turn off

When your Frigidaire 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. A stuck contact between the common "C" and yellow "Y" thermostat wire terminals can keep the contactor energized even when the thermostat is set to Off. If the thermostat tests good, a shorted contactor may be supplying continuous power to the condenser components. This can cause an air conditioner that won't turn off, an AC that keeps running, or a central air system that won't shut off. Disconnect electrical power before inspecting components, and use a multimeter only if you are comfortable testing low-voltage circuits. The condensing unit uses dangerous 240-volt power, so have a licensed HVAC technician handle line-voltage testing or contactor replacement beyond your skill level. Enter your model number to find the exact control board, thermostat, wall thermostat, or contactor for your specific Frigidaire central air conditioner.

01 - Frigidaire 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 - Frigidaire 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 - Frigidaire 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 - Frigidaire 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 - Frigidaire 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 Frigidaire central air conditioner turn off?
Can a wall thermostat cause my central air conditioner to run constantly?
How do I test an AC contactor when the condenser won't shut off?
Should I replace the Frigidaire control board if my AC won't turn off?
How do I find the correct Frigidaire central air conditioner replacement part?

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