The fan runs continuously and the compressor turns on and off only as needed to maintain the set temperature.
The fan runs continuously and the compressor is off.
A function that will reduce the humidity in the room, making it more comfortable. It is good to use in the Spring and/or Fall when the temperature is not hot enough to run the cool mode, but the humidity is a little high. The fan and the sealed system will run, but the unit will not blow out cold air. As the air passes through the air conditioner, the humidity will condense on the evaporator so that the air comes out drier.
LG Knowledge Base (all air conditioners have similar modes of operation).