How do I reset the filter check indicator lights?
For Pre-Filter and Enhanced Odor & VOC Filter reset, with the unit powered off, press the Filter Reset button 2 times within one second—the indicator light will blink twice then turn off. For HEPA Filter reset, with the unit powered off, press and hold the Filter Reset button for two seconds—the indicator light will blink twice then turn off. (Page 8)
From the official Honeywell Hpa5100 Air Purifier manual, page 8
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