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My freezer was unplugged for a few days and now when I plug it in it makes a very loud alert kind of buzzing noise. It isn't just the noise it makes regularly.

It is a loud, almost alarm-like noise that is very worrisome. What could it be? How can I get it to stop?

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Is this a chest freezer or part of a fridge/freezer? Did it defrost completely? I used to get fan noise from ice buildup. – HerrBag Apr 5 '13 at 1:48
Is the freezer still chilling down; or is it still making noise despite having reached normal operating temperature? – Dan Neely Apr 5 '13 at 15:58

Some freezers have an alarm so that you know that the internal temperature rose to an unsafe level for any food stored in it - for example if there was a long power outage whilst you were out of the house.

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