The part(s) or condition(s) listed below for the symptom Freezer beeping/alarm sounding are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.
After a power outage the freezer display will typically beep and/or flash a code like PO for power outage or PF for power failure. In most cases you will need to press a button to reset the alarm. Refer to the owner's manual for specific information.
If you've confirmed there has been no interruption of power to the freezer, the door or doors are all closing properly, and the temperature inside the appliance is sufficiently cold, it's likely the freezer's door switch is malfunctioning and will need to be replaced.
When a freezer is beeping, a fault code will usually be displayed to help diagnose the issue. Refer to the owner's manual for fault code designations and possible solutions.