On a ductless (split air) air conditioner, the indoor unit can be operated without the remote control by pressing the "Emergency Run" button with a non-metallic pen or pencil. You will find the button in an opening underneath the unit cover on the right side of the case. Simply press the Emergency Run button for 1 second until you hear a single beep, indicating the unit has been put in Auto Mode. While in this mode, the unit will maintain 79° for Cooling and 73° for Heating.