Grundig HD-1903A Manuel D'utilisation page 8

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Note: When the appliance is on, it displays the current humidity
level. When the humidity level reaches the % you set, the
appliance will stop misting.
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Be aware that there may be a discrepancy between the reading
on your home humidity meter and the reading given by the
humidifier, depending how close the humidity meter and the
humidifier are to one another. The humidity reading given by the
appliance reflects the humidity % in its immediate vicinity.
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Press LIGHT on the base or on the remote control to turn the
night light on/off.
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Press the SLEEP icon on the base or on the remote control to
turn the LCD screen on/off.
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If there is not enough water in the water tank, the appliance will
beep and the display will show a flashing warning. The
appliance will stop working after several seconds. Unplug the
appliance and refill the water tank.
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Note: If moisture collects around the appliance, this is not a
defect. It may be an indication that the humidity level is set too
high. Reduce the mist output or reduce the humidity %.
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It is normal to hear a dripping sound, especially when the mist
output setting is high.
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If the appliance is not going to be used for an extended period
of time, unplug it from the power supply socket.