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HomeRepair HelpKelvinator Central A/C RepairKelvinator Central air conditioner won't turn off Repair

Kelvinator Central air conditioner won't turn off

When a Kelvinator 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. A defective wall thermostat or thermostat wiring is another common cause of an AC that keeps running. If the thermostat contact stays closed, it continues sending a signal through the yellow Y thermostat wire to the control board and contactor, even when the thermostat is set to Off. A shorted contactor is less common but can keep the condensing unit energized after the control signal stops. This troubleshooting may involve low-voltage testing, but the contactor and other outdoor components also contain dangerous 240V line voltage. Turn off power at the disconnect box and circuit breaker, and hire a qualified HVAC technician for electrical work beyond your training. Refrigerant or sealed-system repairs require EPA 608 certification. Enter your Kelvinator model number to find the exact replacement control board, thermostat, or contactor for your central air conditioner.

01 - Kelvinator 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 - Kelvinator 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 - Kelvinator 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 - Kelvinator 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 - Kelvinator 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 Kelvinator central air conditioner turn off?
How do I test a Kelvinator thermostat that won't turn off the AC?
Can a bad contactor or control board make a central AC run constantly?
How do I safely inspect a Kelvinator central air conditioner that won't shut off?
How can I find the correct replacement part for my Kelvinator central air conditioner?

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