Was the door left open?
The Door Ajar Alarm feature sounds an alarm when the refrigerator door(s) or freezer drawer is left open for 2-5 minutes, depending on the model, and cooling is turned on. The alarm will repeat every 2 minutes. Close all doors to turn off and reset the alarm.
NOTE: To mute the audible alarm while keeping the doors open, such as while cleaning the inside of the refrigerator, touch any button on the control panel. The alarm sound will be temporarily turned off, but the Door Ajar icon will still be displayed on the dispenser control panel.