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Hello! Thank you for reaching out. The yellow LED is the carbon filter light that indicates if the carbon pre-filter needs to be changed. Carbon filters need to be replaced every 3-6 months. Filter life will vary depending on air quality and usage. For direct and immediate assistance, kindly give us a call at 1-800-253-2764. We're here for you Monday to Friday from 9:00 am till 6:00 pm EST. You can also contact us through chat and email by clicking this link: https://www.holmesproducts.com/customerservicecontact?cid=contactus. Our product specialists will be more than happy to help you.
Sorry, there was a problem. Please try again later.I have this purifier & the yellow light is a reminder to change the carbon filters (black). The red light means it's time to change the HEPA filters (the carbon filters sit on top of them.) I have an older unit & I have to reset the light manually by pushing on it with something like a paper clip. Maybe the newer ones will reset automatically
Sorry, there was a problem. Please try again later.When that light is on it is indicating that it is time to change the carbon pre-filters, the black pieces of filter material that are held on top of the hepa filters by the plastic tabs.
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