Last updated on May 29th, 2022

Air filters on Blueair Blue Pure air purifiers are made to last for 5-6 month maximum. After their lifespan expires, they need to be replaced with a new air filter. Here are links to the genuine replacement filters:

After you have a replacement filter, replace the old with a new one. NOTE: Before replacing the filter turn off the unit and disconnect it from a power source!

After you have successfully installed the new air filter, follow these steps:

  1. Turn on the air purifier.
  2. Filter indicator will shine red. It’s ok!
  3. To reset the Blueair Blue Pure air purifier 411, 211, 311, 121, etc. press and hold the main (in some cases “filter”) button for 10 seconds.
  4. After the light goes off you can continue using your Blueair air cleaner.

Note again: it’s not always the filter – see Red Light on Blueair air purifiers to understand what red color could mean.

Hopefully, this guide on resetting the filter light was helpful for you. If you have any questions, I will gladly answer them in the comments section.

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6 thoughts on “How to Reset Blueair Blue Pure Air Purifier

  1. God morning – I recently replaced the core filter to the 411 and washed the exterior filter. Currently no light is on. I can feel a faint current of air on top. Does this mean it is working properly?

  2. I replaced my Blueair 411 with a new filter last month, just before it was due. Today, I noticed the top lights were all red and the unit was not functioning.
    I read the manual and looked at the the blueair website and did not find a solution. I had just replaced the filter, so I can’t be a warning or clog or malfunction, right?
    I googled and found this site. Looked through and there is the solution:
    Press and hold the center button for ten seconds.
    This worked and it is now reset.
    If this is a problem for you, just try that.
    Hope this helps.

    1. Thanks couldn’t find booklet so concerned when light stayed red. 10 seconds after finding your fix, all OK again. Thanks

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