Gree XE71-42/G Owner's Manual page 50

If timer function is turned on, the set hours will decrease as the unit operation
time increases. In this case, residual hours can be viewed after entering timer setting
page. This timer function will be executed for only once and then it will be cancelled
automatically.
NOTE!
If this timer function is turned on, when the unit is turned on or turned off, this
timer function will be cancelled automatically.
Figure 4-18 Countdown Timer Off
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Wired Controller XE71-42/G