Gree XE71-42/G Owner's Manual page 54

Items can be locked: ON/OFF, MODE, SET TEMPERATURE, FAN SPEED, KEY
LOCK. Once locking is finished, the corresponding item cannot be set through
buttons.
If the keys are locked, all keys cannot be operated after returning to the main
page. Please unlock according to the instructions on main page. During unlocking,
press "MENU/OK" button, press "˂" button and then press "˃" button to unlock keys.
Figure 4-21 Lock Setting
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Wired Controller XE71-42/G