“Why is the blue light now yellow? Just changed the filter but still yellow.”

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• HI there! Thanks for reaching out! The unit doesn't know that the filter has been changed. Press and hold the button down for a solid 15 seconds the light should blink then go back to normal.

  Answered by Blueair Support Team 5 years ago

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• Hold the thing that says blue until it turns white or blue

  Answered by Anonymous 1 year ago

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• Check the manual. The light has to be reset.

  Answered by BlueAirGuy 5 years ago

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