How to set this chiller?

How to set this chiller?

1.Turn on the switch, the display shows what the current ambient temperature is.
2.Press the SET key to set our target temperature, for example, we want to reach 73°F
3.After the setting is complete, the screen will display the current temperature and then gradually cool down.
4.The "COOL" light is on, indicating that the machine is working
5.You can feel the chiller vibrating
6.Hold the SET key for about 8 seconds to enter F1 mode
7.Press the SET key again to see the number 5
10.The number 5 represents: the chiller will not run unless the target temperature is lower than the ambient temperature. Please do not change this number randomly.