Parental controls lock the control panel so that no damage can be done to the ventilation unit by random pressing of the control panel buttons.
To set the parental controls:
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Select Expert settings.
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Parental controls settings are described in the Parental controls area.
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Turn the parental controls on or off by using the On/Off button on the right side of the Parental controls text.
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When the value is On, the parental controls are turned on.
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When the value is Off, the parental controls are turned off.
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The parental controls are now either turned on or off depending on your choice.