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3 is supposed to be the setting the freezer is on but if you're getting frost build up inside it means that it's getting too cold. You'll have to find somewhere between 5 and 3. If you have a thermostat you can put inside, the freezer should be at 0 degrees so you can adjust accordingly.
Aye, they just worded it incorrectly. They meant to say that 0ºF is ideal, not the setting.
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