It means clean or replace filter. You can get it to stop displaying the CF by turning unit off and unplug for 30 seconds. Plug back in and turn back on. CF should now be gone. Hope this helps.
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.
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