Hello, this is Ava with Think Crucial.
If your unit has a reset button, try resetting your unit. Also, replacing the filters and resetting it after putting on the replacement filters usually works. If this fix doesn't work, I suggest you contact Hunter support for assistance and their number is 888-830-1326.
You can purchase a wide variety of high quality Hunter replacement parts for your Hunter Air Purifier direct from Think Crucial with free shipping and an exclusive 10% coupon for Fixya.com readers, use code: FIXYA10
http://www.thinkcrucial.com/search?type=product&q=hunter
I hope this was helpful.
Ava B.
Think Crucial Customer Care
http://www.thinkcrucial.com/
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