mabe RMV21WIM Owner's Manual page 38

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4. lock function
This function will block your LCD control preventing from some one
to change your programation.
To activate or deactivate, press simultaneously for 3 seconds the
alarm and vacation buttons.
You will notice that the function is activated since the padlock
animation will be started and it will continue until the function is
deactivated, this means all functions are blocked.
If you press any button, an animation will start and you will hear a
sound indicating that the Buttons are blocked.
5. temperature level
This function let you choose the cold level for your refrigerator from
1 (less cold) to 9 (coldest). Each time you press the "level" button,
the next subsequent number will appear when it reaches 9 it wil
start all over from 1. If you keep pushed the "level" button, the
subsequent numbers will continue appearing untill you left the
button. At the same time an animation will show up in the screen.
Note:
For the activation of the functions you don´t need to press hard the
buttons. All functions take half second to activate.
When you plug the refrigerator, all function images should turn on
for 3 seconds y and you will hear a sound at the same time.
After those 3 seconds the screen will be turned off and it will be
positioned on cold level 5 in which ti shows the digit in case of being
the first connection, if not it will return to the last level selected.