Hi and Welcome to Just Answer,
Ok, let's take a look at this;
3 is usually the perfect setting, I keep both my fridge and freezer on these settings. Now depending on where you are at you may need to tweak it a little, but 3 should be what you want it on.
What I do is I keep a thermometer in the fridge to make sure that I am around 35 and 38 degrees. If you are colder or hotter, just adjust 1 number and then let it run for 24 hours and check it again.
If you need more help Let me know
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