Hello, this is Ava with Think Crucial.
It looks like you may need to change your filters. It is advisable to change filters every 3-6 months for optimal use. When replacing your filters, make sure that the unit is turned off and unplugged from the power. Once filters are replaced, turn on your unit then press and hold the filter check indicator button for 3 seconds. The indicator light will blink 3 times and turn off, and reset the filter change timer.
You can purchase a wide variety of high quality Holmes replacement parts for your Holmes Air Purifier direct from Think Crucial with free shipping and an exclusive 10% coupon for Fixya.com readers, use code: FIXYA10
I hope this was helpful.
Think Crucial Customer Care