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With the thermostat in the off position, the answer would most likely be the fan control or fan switch. This would most likely occur during the summer when temperatures are higher. The function of the control in normal operation is to keep the fan going to extract the balance of the heat from the heat exchanger after the burner cycles off in a call for heat. If it is a Honeywell adjustable, you can hold the dial in place and adjust the pointer that is set to the "lower" temperature of the two pointers. You would increase the setpoint of the pointer a bit. If it is not adjustable, replacing the control would be the answer if you can't live with it.

Answer It continues to run after shut off for a minute or so to clean the lines of heat/cool air. It also runs intermittantly to recirculate air to filter dust out and even out the temperature. This will also happen in the winter if you have frost protection. External frost protection set point 0-5c internal set point can vary but normally about 8-12c.

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15y ago
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16y ago

Many window AC units have a "power saver" feature that only runs the fan when the compressor is running. Therefore the fans stops when the compressor cycles off. This may be your situation. The "power saver" feature is usually a selectable feature. One of the control buttons should change the setting so that the fan runs all the time.

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14y ago

Turn it off until it can be looked at. Short cycling will kill the compressor.

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Q: Why does my fan keep turning on and off every 2-3 minutes on my air conditioning unit?
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