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Air Conditioner won't run

If your air conditioner won't run, start by separating a control problem from a power problem. On many room and window units, the most likely failure is the control board, which sends voltage to the compressor and fan motor. The main control board can cause the same no-run condition, so confirm simpler issues before replacing either board. If the unit has power but won’t respond to button selections, the user control and display board may be unable to tell the air conditioner to start. A faulty selector switch can also stop voltage from reaching the fan motor, especially if the fan runs intermittently, or you see arcing or smoke near the switch. If the AC won’t turn on at all, check incoming power next: make sure the unit is plugged in, the outlet works, and no breaker or fuse has tripped. Whether your window air conditioner is not turning on or the air conditioner has no power, enter your model number on RepairClinic.com to find the exact control board, main control board, user control and display board, or selector switch made for your specific air conditioner.

01 - Air Conditioner Control Board

The control board regulates the voltage to the compressor and the fan motor. If the control board fails, some components will not function properly or will not work at all. Control boards are often misdiagnosed; make sure to check more commonly defective parts first before replacing the control board.

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Highly Likely

02 - Air Conditioner Main Control Board

The main control board regulates the voltage to the compressor and the fan motor. If the control board fails, some components will not function properly or will not work at all. Control boards are often misdiagnosed; make sure to check more commonly defective parts first before replacing the main control board.

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Highly Likely

03 - Air Conditioner User Control and Display Board

The user control and display board allows the user to operate the unit by selecting fan speeds and cooling temperatures. If the board is defective, the air conditioner may be unable to run. If you've confirmed power it reaching the unit, it's possible the user control and display board is malfunctioning and will need to be replaced.

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Highly Likely

04 - Air Conditioner Selector Switch

The selector switch directs voltage to the fan motor. If the switch is faulty, the fan motor may not turn on and the air conditioner won't run. To determine if the selector switch is at fault, try making selections on the air conditioner’s control board. If the fan runs intermittently after you press a button, replace the selector switch. Additionally, if there is any arcing or smoke coming from the selector switch, replace it.

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Common

05 - Incoming Power Problem

Check to see if there is power to the air conditioner. One or more indicator lights on the control board should be illuminated. If there is no power to the air conditioner, check to see if a circuit breaker has tripped or a fuse has blown. Confirm the unit is plugged in and has power.

Common

Frequently Asked Questions

Why won't my air conditioner run at all?

What should I check before replacing an air conditioner control board?

Can a bad selector switch keep a window air conditioner from turning on?

Why does my AC have power but the buttons or display do not work?

How do I find the right replacement part for an air conditioner that won't run?

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