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How to Troubleshoot A/C Wall Units

    • 1). Check for a tripped breaker or blown fuse if the unit will not power on. Test the outlet you are using by plugging something else into it to make sure the outlet is working.

    • 2). Look at the thermostat knob to see what setting it is on if the air temperature is not cool enough. The knob may have gotten turned to a warmer setting.

    • 3). Listen to the unit to see if there is a continuous noise coming from it. If there is a constant noise and it is not cooling, it needs to be serviced by a professional. The noise and lack of cool air indicates a problem with an interior component.

    • 4). Look at the air damper to make sure it is closed. The air damper has slots that open and close. If it is open, you are bringing in outside air, which reduces the efficiency of the unit and results in cool air that is not as cool as it should be.

    • 5). Remove any covering that you placed on the unit during the winter. It cannot run with the cover on because the cover prevents it from pulling in air.

    • 6). Clean out any debris that has accumulated on the coils, which are on the inside of the unit. The coils can only be accessed by taking the unit out of the window and removing the cover. Clean with a soft bristle brush.

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