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ICP Central air conditioner won't turn off

If your ICP 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 defective wall thermostat or thermostat wiring can also cause an air conditioner that won't shut off when its contacts stick closed and continuously signal the contactor through the yellow thermostat wire. Less commonly, the contactor itself may be shorted and keep the outdoor unit energized, causing the AC to keep running or the air conditioner to run constantly. Turn off power at the disconnect box and circuit breaker before inspecting components. Testing or replacing a thermostat may be suitable for a capable DIYer, but the control board and contactor involve low- and line-voltage circuits, including potentially dangerous 240V power, so use a qualified HVAC technician for testing or repair beyond your comfort level. Enter your ICP model number to find the exact replacement control board, thermostat, or contactor for your central air conditioner.

01 - ICP 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 - ICP 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 - ICP 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 - ICP 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 - ICP 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 ICP central air conditioner turn off?
How do I test an ICP thermostat that is not turning off the AC?
Can a bad AC contactor make the central air conditioner run constantly?
Should I replace the ICP control board if my AC won't shut off?
How do I find the correct replacement part for my ICP central air conditioner?

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