What does the CHECK FILTERS light mean?
The CHECK FILTERS light illuminates after 2160 hours (3 months) of operation to remind you that it is time to wash the ifD® Particle Filter and replace the Odor & VOC Reducing K Pre-filter. The light will shut off automatically when the clean ifD® Particle Filter is properly reinstalled. (Page 3)
From the official Honeywell HFD360 Air Purifier manual, page 3
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