Check Filter Indicator The ability of any humidifier to efficiently supply humidity output relies heavily on the condition of the filter. As the filter loads with impurities it gradually loses its wicking capability. When this happens, moisture output is reduced and the humidifier has to work longer to satisfy the selected setting. This humidifier has a check filter reminder timed to appear after 720 hours of operation. When the Check Filter (CF) message is displayed, disconnect the power cord and check the condition of the filter. If a build-up of deposits or severe discoloration is evident replace the filter to restore maximum efficiency. The CF
message is reset when the humidifier is plugged back in.
SOURCE: Kenmore 15408 Humidifier How to Reset CF
Per the owner's manual, you simply unplug your device for 30 seconds. Upon plugging it back in, the CF notification should be cleared.
This assumes you have also changed the filter, of course.
SOURCE: i have lost my manual. readout on the digital
It means Change Filter.
However, assuming that you have done that in the recent past, you probably want to know more. I'm not sure how this actually works (that is why it shows CF). I saw it for the first time after 2 or 3 years of using my humidifier. (And I had just changed the filter a week or so previously).
You may have to turn the unit off/on or even unplug it to clear the message, then it should operate normally.
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