Did not get a manual. My question is regarding internal control switch. There is of course a dial for temperature. I am guessing higher the #, the colder. There is also a switch next to it. Markings on one side is a straight line -, other side a circle 0. When you push in the - switch side the front of the switch exposes a red colored portion of the switch. When you push down the 0 front portion of the switch it depresses/hides the red colored portion. So do not know what that is representing...