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Amana Central air conditioner won't turn off

If your Amana central air 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 control board can continue sending voltage to the outdoor condensing unit, causing the AC to keep running even when the thermostat is set to Off. The main control board can cause the same problem and should be inspected for 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 condensing unit's contactor to run. Less commonly, a shorted contactor can keep supplying power to the compressor and condenser fan motor. This Amana AC troubleshooting involves electrical testing: shut off power at the disconnect box and circuit breaker before opening panels, and do not work on exposed 240V components unless qualified. Testing low-voltage thermostat wiring with a multimeter may be suitable for a confident DIYer, but have a licensed HVAC technician handle line-voltage repairs. Enter your model number to find the exact replacement control board, thermostat, wall thermostat, or contactor for your specific Amana central air conditioner.

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

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