The Product doesn't work

Is power not supplied?

Supply Power

The Product doesn't work through you press the 'ON' switch

Is the Indoor temperature less than 15 \ or more than 40 \?

It's standby mode for protecting Total Heat Exchanger.

Even though you change the fan speed, the operation mode doesn't change and it changes to 'Auto or Low'

Is the Indoor temperature less than -10 \ or more than 45 \?

It's operation mode to protect Total Heat Exchanger.

Even though you push the button of remote controller, any function doesn't work.

Is the icon "┴" displaying on remote controller?

It's Child Lock mode. Refer to Remote controller.

Is the icon displaying on remote controller? Does the message "HL" display on remote controller when you push the button.

It's centralized control mode. You can't control on remote controller.