York YUHC 18, Service Manual, Page: 22 / 49

4. Other Functions
4.1 LED Display
Operation lamp, timer lamp, defrosting/pre-heating lamp, and water level alarm lamp.
4.1.1 Operation Lamp
When the operation is recovering, it will blink at 1 Hz.
After the air-conditioner is on, the lamp will keep on.
After the air-conditioner is off, the lamp will be off.
When the air-conditioner is switched over from manual cooling to remote control, the lamp will be off.
4.1.2 Timer Lamp
During timer operation, it will be on.
4.1.3 Defrosting/Pre-Heating Lamp
When heat pump model performs defrosting or anti-cold air, it will be on.
4.2 Timer
Refer to remote controller manual for detail operation.
Note: The timer is valid for one operation of the A/C.