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Coleman 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. A shorted board can keep sending voltage to the outdoor condensing unit, so the air conditioner keeps 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 wall thermostat or thermostat wiring. A stuck contact between the common "C" and yellow "Y" thermostat wire terminals can continuously signal the control board and contactor to run the system. If the thermostat tests good, a shorted contactor may be supplying constant power to the condenser components. Testing thermostat continuity with a multimeter is within many DIYers' abilities, but disconnect power before inspecting or replacing parts. The contactor and other condensing unit components involve 240V line voltage, so use a licensed HVAC technician if you are not qualified to work safely with high voltage. Enter your Coleman model number to find the exact replacement control board, thermostat, wall thermostat, or contactor for your central air conditioner.

01 - Coleman 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 - Coleman 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 - Coleman 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 - Coleman 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 - Coleman 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 Coleman central air conditioner turn off?
How do I test a thermostat when my central air won't shut off?
Can a bad contactor cause my AC to keep running constantly?
Should I replace the Coleman control board if my air conditioner won't turn off?
How do I find the correct replacement part for my Coleman central air conditioner?

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