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McQuay Air Conditioner won't run

If your McQuay air conditioner won’t run, start with the parts that control power to the major components. A failed control board is one of the most likely causes because it regulates voltage to the compressor and fan motor, and a bad main control board can cause the same no-run condition. If the unit has power but the buttons or display do not respond correctly, the user control and display board may be preventing the AC from turning on. A faulty selector switch can also stop voltage from reaching the fan motor, especially if the fan runs only intermittently when you press controls or if you see arcing or smoke near the switch. Before replacing any board or switch, confirm the McQuay air conditioner has no power issue by checking the plug, breaker, fuse, and any indicator lights on the control panel. Once you identify the failed part, enter your model number on RepairClinic.com to find the exact replacement control board, main control board, user control and display board, or selector switch for your specific McQuay air conditioner.

01 - McQuay 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 - McQuay 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 - McQuay 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 - McQuay 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 McQuay air conditioner run?

What should I check first if my McQuay AC won't turn on or has no power?

Can a bad selector switch keep a McQuay air conditioner from running?

How do I know if the McQuay air conditioner control board or main control board is bad?

Could the user control and display board cause my McQuay AC not to run?

How do I find the right replacement part for my McQuay air conditioner?

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