Will a fridge/freezer work properly if empty?

I’m waiting for a repair person to fix my fridge/freezer this week, and I want to know if when I tossed my defrosted food can effect the effectiveness of my appliance.

Someone had turned to low, and I got sick from drinking warm milk and honeydew melon. It was turned to normal and then 4/5, and finally to 5/5.

Is there anything that I should know?

It doesn’t get cold enough to preserve food, and the freezer does not get cold enough to freeze liquids. Even at maximum cold?