Philips HU4902 User Manual page 21

Problem
No air comes out
of the air outlet.
I do not see visible
mist coming out of
the humidifier. Is it
working?
I want to check
whether the
humidity sensor
works or not.
Possible solution
Put the plug of the humidifier into the wall socket and switch on the humidifier.
When mist is very fine, it is invisible. This humidifier has a NanoCloud
humidification technology, which produces healthy humid air from the outlet
area without formation of water mist.Therefore, you cannot see the mist.
Gently blow moist air into the humidity sensor. After a while, the humidity
indication changes. Note that if the initial humidity indication is already 60
percent, the indication cannot show an even higher humidity when you blow
moist air towards the sensor.
EN
21