Blue Product Family Troubleshooting

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Why is there a red light on my air purifier?

A red filter replacement indicator appears on the air purifier when it is time to change filter. 

The unit will show 3 red lights if the air purifier is on Auto Mode, or 1 red light if another fan mode is selected.

Reset the red light(s)

Press down the button until the red light(s) disappears (Usually takes 7-10 seconds and may take up to 30 seconds depending on the model).

Blueair recommends to change filter after six months of use. If you use your air purifier in a highly polluted environment, you may need to change filter more often. 

How is Filter Lifetime Calculated?

The filter lifetime is calculated on the usage of the air purifier. The filter indicator light turns red after 6 months of operation.


The filter light indicator turns red after 6 months of operation of the air purifier to indicate to change filter. Press down the filter light or the button until the red light disappears (Usually takes 7-10 seconds and may take up to 30 seconds depending on the model).

In some Blue models, the filter light turns yellow after 5 months of continual use. This indicates that it will be time for your filter change in one month and it is time to order a new filter  Press down the control button until the yellow light disappears (Usually takes 7-10 seconds and may take up to 30 seconds depending on the model).

If you can identify your model in the below images, click on your model to go to the correct filter page.

Blueair Bottom of air purifier unit

What type of filters are used in the air purifier?

The Blue air purifiers use one main filter and one pre-filter:


Main filter:

  • The standard main filter is a Particle filter with a Carbon mesh for particle removal and gas reduction.
  • SmokeBlock filters can be used as replacement filters in Blue air purifiers, instead of the standard Particle + Carbon filters. The SmokeBlock filters offer extra protection against wildfire smoke particulates and emissions (toxic gasses, smog and odors), in addition to protection against airborne particles (dust, smoke, pollen).


  • The pre-filter is a fabric personalizable pre-filter that can be vacuumed and washed in the washing machine regularly (washing instructions can be found on the label of the pre-filter). The pre-filter catches large particles and protects the main filter inside the air purifier.

What is the recommended maintenance for the air purifier and the filters? 

  • Vacuum the air purifier and its pre-filter
  • Clean the fabric pre-filter in the washing machine
  • Clean sensors according to the instruction in the user manual
  • Replace the main filter when your air purifier indicates it is time to change it. To reset the filter light indicator, press down the control button until the red light disappears (Usually takes 7-10 seconds and may take up to 30 seconds depending on the model).

For more information, see the user manual.

My air purifier doesn't start...

Turn off and unplug the air purifier ​​

Check the power cable: ​

If your air purifier has a removable power cable, plug the cable firmly into the power cable socket on the air purifier. If the power cable is damaged, contact the Customer Support.

  • Make sure that there are no objects or dust: ​
  • Inside the air purifier, on top of or directly against the air purifier​, around the air inlets and air outlets​.
  • On the pre-filters, if your air purifier has pre-filters.
  • Around the air quality sensors, if your air purifier has integrated sensors.

Check the filter: ​

  • Make sure that the plastic wrapping around the filter is removed​.
  • Insert the filters and make sure they are correctly inserted​​.
  • Make sure the filter door is completely closed, or that the top of the air purifier is correctly attached to the bottom.​​
  • Confirm that your device is functioning
  • Plug the power cable firmly into an outlet.​
  • Press the On/Off button to turn on the air purifier and select a speed level. If the air purifier does not have a On/Off button, directly select a fan speed from the control panel.​​
  • Make sure that the LED indicators on the air purifier are lighting up​.​
  • Make sure that the airflow is working (feel with your hands that air is coming out from the air outlet)​.

If the air purifier still does not work as expected​:

  • Try to plug the power cable into another outlet. Or test your outlet with another device. For instance, you can plug in a lamp and see if it lights up​.​
  • Connect your air purifier to the Blueair App to make sure it has received the latest firmware update (if your air purifier has the WiFi feature).​
  • If you are using a power converter, make sure to check the rating label of your air purifier and verify that it is certified for use in your country. ​​

If your air purifier still does not function as expected, or if you notice any damage on the device, please contact the local Blueair Customer Support team:​

Air quality lights are off on my air purifier...

If all light indicators on your air purifier are turned off, you might need to adjust the LED brightness settings in the App or deactivate the Night Mode.  

Night Mode

If your air purifier is set on Night Mode, the LED brightness and the fan speed levels will be reduced.  ​

When activated, the Night Mode is indicated on your air purifier, or directly in the Blueair App, depending on your model: 

To deactivate the Night Mode: select another fan speed on your air purifier.​

​Notes: The Night Mode is not available on all models. Different LED dimming solutions exist depending on the product. Always refer to the user manual for more information.​

If the air quality lights keeps being turned off or changing colors frequently, the air purifier may be determining the air quality in the room. You might need to wait for a few minutes and re-start the air purifier if needed. ​

​Restart the air purifier​

1. Disconnect the power cable from the wall outlet and wait approximately 30 seconds ​​

2. Make sure that there are no objects or dust:

  • Inside the air purifier​
  • Around the air inlets and air outlets ​
  • On top of or directly against the air purifier ​
  • On the pre-filters, if your air purifier has pre-filters​
  • Around the air quality sensors, if your air purifier has integrated sensors.​

3. Reconnect the power cable​​

4. For Blue Auto, HealthProtect / Protect and DustMagnet, you should see the air quality LEDs flashing. ​​

5. Wait two minutes.​

6. The LED indicators should be visible.

My filter has a smell...

New filter​​:

  • New products may emit an odor when opening the box, that is normal.​
  • All materials have their own smell, including filter materials. The filter is enclosed by a plastic bag and a cardboard box, and the smell from the product is accumulated inside. The smell from filter media is harmless.​​
  • Run your air purifier and ventilate your room to air out the air purifier and its filter to reduce the new filter odor faster. ​
  • You may also place the new filter by an open window before starting using it or run your air purifier in a room where you spend less of your time, just for a few days until the odor fades away. ​

Any questions, please reach out to our Customer Support teams.​​

Used filter / Filter used in strong odor environment​​​​​​​​​:

  • When the filter is full and gets saturated it can start to release a smell, and we recommend replacing it. ​
  • The average expected lifetime of the filter is stated for each Blueair product.​ However, the expected filter lifetime can be highly dependent on the environment the air purifier is in which could require more frequent replacement.​

Note: it is not possible to remove all odors, ventilation in addition to using air purifiers will help get rid of strong odors.​


The air purifier makes an unexpected noise​.

Expected noise with air purifiers​

High speed level: Air purifiers that are set on a high-speed level produce more noise because they function at faster rates. On low fan speed, the air purifier should be quieter.​ ​

Dirty filters and pre-filters: If the main filter(s) or pre-filter(s) are very clogged or dirty, the engine might not get sufficient airflow, which may result in increased noise levels. ​

Room environment: In an empty room with high ceilings and hard material there may be increased sound with the echo, compared to room with carpet and other furniture which may help absorb noise created by the device.​

If your air purifier makes an unusual sound ​

1.Turn off and unplug your air purifier​

2. Remove the main filter(s) according to the instructions in the user manual and make sure that you have removed the plastic cover from the filter (not applicable to all models and filters).​​

3. Make sure that there are no objects or dust: ​

  • Inside the air purifier (for Blue air purifiers, look through the top of the unit).​
  • Around the air inlets and air outlets​​
  • On top of or directly against the air purifier​​
  • On the pre-filters, if your air purifier has pre-filters​

4.Re-install the filter and pre-filters correctly.​

5.Ensure that the air purifier is with at least 10 cm from any objects or wall.​​

6.Make sure that the air purifier is standing stable on an even surface. ​​

If the noise continues​ please contact the Blueair Customer Support to get help. ​If you notice any damage on the device, please contact the Blueair Customer Support.

Blueair Sensor location on Blue Auto air purifiers
Location of sensors on Blue Pure Auto family air purifiers.

Does the air purifier indicate the air quality levels of the room?

The 411 Auto, 311 Auto and 211+ Auto air purifiers have integrated particle sensors that can detect indoor air pollution level and display your air quality levels with the LED at the front of the unit in blue, amber and red.

How to decrease the particulate matter (PM) levels and improve your indoor air quality?

  • Make sure that the air purifier is used in an adapted room size with closed windows and doors. ​
  • Set the highest speed of the air purifier temporarily or use the Auto Mode (not available with all models). ​
  • Ventilate the room temporarily. 

What to do if the PM levels do not decrease? ​

  • Try to find the pollution source. If the PM values are constantly high, the indoor air might be polluted. If your air purifier has the WiFi feature, the Blueair app can help find the source of pollution. Open the Blueair app, add your air purifier and check the air quality history: check the peaks’ date and try to think of what can have happened at those moments. ​
  • Test the air purifier in a smaller room. Test the PM sensor by placing the unit in a small room running at full speed with all windows and doors (and ventilation if possible) closed.
  • ​Clean the sensors. If the PM levels are constantly very high, there might be accumulated dust on the sensor giving a false indication. Vacuum the outside of the air purifier, especially the air inlets, outlets, and the inlet for the air quality sensor. Power off the unit before vacuuming. See sensor care and maintenance FAQ. and user manual. ​

If the above actions did not help, please contact our Blueair Customer Support teams to investigate further. 

The air quality indication is different from my other Blueair air purifiers or air monitors.

Small deviations between the sensors’ readings are normal because PM sensors in Blueair air purifiers use different measurement technology - depending on the Purifier model.​

Large differences between sensor readings may happen if the sensors are clogged with dust. Try to vacuum the sensor from the outside. The air quality indication should improve shortly after the vacuuming.​

If the issue remains, please contact your Blueair Customer Support.

Why is the air purifier detecting high levels of Particulate Matter (PM)?​

​Particulate Matter (PM) peaks are normal and expected to happen temporarily, even when the air is of good quality because your air purifier’s sensors react each time the air purifier is in contact with airborne particles.​

Pollution from outside coming in from open windows or ventilation may also cause high PM levels.​

The levels of PM should decrease with the use of the air purifier and with ventilation. ​

Examples of PM sources: candles, smoke, cooking, incense, fireplace, accumulated dust, unfiltered vacuum cleaner, pollen, pets, etc.

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