what is df in ac

DF in AC stands for "Defrost Function". When an air conditioner is in heating mode, the outside coil can frost up over time. The defrost function is activated to remove the frost and prevent any unnecessary strain on the air conditioner that can cause it to break down further. The DF code is not an error code, but rather an indication that the system is defrosting the outside unit. It can appear on the display of the indoor unit during the defrost function, and the air conditioner stops running to prevent cold air from coming out of the indoor unit. The DF code can also appear at random times of the day during the winter months, which is normal.