Last updated on December 1st, 2022

Red Light on Blueair air purifiers could mean two different things. I explain them down below.

Bad Air Quality

Blueair air purifiers of Classic series 280i, 480i, 605 and 680i are equipped with the Air Quality Indicator. It shining Red when the unit’s sensor detects many airborne particulates (dust, odor, pollen, bacteria, etc.). You either have to put the air purifier in Auto or select the maximum speed to clean the air as fast as possible. When the air is clean, Air Quality Indicator will switch its color to Blue.

Some Blueair air purifiers of Blue series like Blue Pure 411 Auto and 311 Auto have Air Quality Indicator. As with the Classic air cleaners, Red color mean bad air quality.

Note, that not all Classic air purifiers have it too. Model 205 doesn’t have it.

Blueair DustMagnet models 5210i, 5240i, 5410i and 5440i also have such indicator.

Reset the Filter

The other case of the shining red light on a Blueair air purifier is an expired air filter. Blueair Blue Pure 411, 311, 211 and 121 doesn’t have any Air Quality Indicator, so when you see a red light coming from one of such units, you should get yourself a replacement HEPA filter (check prices), put in in place and reset the filter light. I go into details on How To Reset Blueair Blue Pure Air Purifier page.

All other Blueair air purifiers are also equipped with a filter reset indicator. When it turns red you have to replace the air filter, so your Blueair air cleaner can continue its job or providing you with the clean and fresh air.

Hopefully this quick guides has helped you to fix red light on your Blueair air purifier!

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5 thoughts on “Blueair Blue Pure Air Purifier Red Light: Meaning and How to Fix

  1. I have a Blueair 411+ air purifier. I have read the manual, looked through the FAQs on the Blueair website and cannot find any information which solves the problem of the red light not resetting. I washed the outside cloth cover in the washing machine and dried it, vacuumed the inside of the filter and used a damp sponge to clean dust off the plastic surface, put a brand new Blueair filter into the 411+ and pressed the on button for 5-15 seconds. The red light will not change back to white. Any ideas about what might be going on?

  2. I have Blueair 480i with same issue (orange PM2.5 “Very Polluted” light on all the time). I have a second unit and if I put it next to the problem unit, it shows that the air is clean.

    I have vacuumed and compressed-air cleaned but not improvement.

    Does anyone know where the PM2.5 sensor actually is? Is it the holes on the bottom of the unit?


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