How To Reset The Filter Light On Blueair Air Purifiers

The reset process is different for each Blueair model. After changing the filter, press the filter replacement button (Classic Series), main button (Blue Series), red circle (Sense, Sense+, Pro), or the reset/timer button (E-Series) for 7 to 10 seconds, until the light turns off. To reset a DustMagnet model, press and hold the fan speed button for 15 seconds.

The filter light on Blueair air purifiers typically illuminates when the filter is clogged or needs replacement, but it can also indicate underlying technical problems with the unit. After replacing the filter or resolving the issue, you will need to reset the filter light to use the air purifier. 

Read this article to learn all you need to know about resetting the Blueair filter. We discuss the different reasons why the filter LED might illuminate and which specific issue a particular color light corresponds to. You’ll also find a step-by-step guide on how to resolve each problem before resetting the light.  

  • Blueair air purifiers need to be reset after filter changes, cleaning or disassembly.
  • The reset button varies between the different series of Blueair purifiers.
  • Blueair air purifiers can be reset by pressing and holding the reset button until the indicator light turns off.

How To Reset Blueair Air Purifiers

The smart Blueair technology features LED lights that illuminate in red or yellow/orange colors to indicate filter life. After changing the filter, you need to reset the light for it to turn it off. 

Although Blueair air purifiers do not come with an exclusive filter reset button (except for some models in Classic E-Series), there are specific buttons on each model that can reset the filter indicator light.  

Here’s a complete guide on how you can reset the filter light on your Blueair air purifier (scroll down to find your series/model): 

Classic Series (e.g., Classic 200, 400, 500, 600) 

The LED in Classic Blueair air purifiers turns orange after 5-6 months of operation, indicating that the filter(s) need replacement within a month

  • To reset the filter light, make sure your purifier is turned on (you should have turned it off and unplugged it while you were changing the filter). 
  • If you have not changed the filter, turn the unit off, disconnect it from the power source, and switch it on after a few minutes. 
  • Locate the ‘Filter Replacement Button’ on the control panel and hold it down for 10 seconds. 
  • The light will turn off, indicating a successful reset. 

Note that the first two steps remain the same for all Blueair air purifiers. 

You can also reset the timer or the unit by holding the filter or timer button for 10 seconds. 

Blue Series (e.g., Blue 121, 211, 211+, 411) 

To reset the filter light in Blue Series, locate the main (power button) on the unit and press it for 10 seconds until the light turns off. 

Blueair Sense, Sense+, and Pro Series 

The Blueair Sense and Pro air purifiers display a red circle when the filter needs replacement. After changing the filter, place your finger on the red circle and wait for it to disappear.  

Classic E-Series (e.g., 270E, 450E, 550E) 

To reset the filter in Classic E-Series:  

  • Hold the Timer/Reset button for 10 seconds.  
  • The filter light will turn off, and the counter (timer) will start again. 

After resetting the unit, you can pause the timer for five days using the Snooze button.  

DustMagnet (e.g., 5210i, 5240i, 5410i, 5440i)

DustMagnet air purifiers have two prefilters as well as the two ComboFilters that need regularly replacement. After replacing the two ComboFilters, turn on your air purifier and press and hold the fan speed button (or airflow speed button) for 15 seconds to reset it.

Protect (e.g., 7410i, 7470i, 7710i, 7770i)

The protect series of Blueair air purifiers do not need to be reset. Removing your old filter, fitting a new one and closing the purifier is sufficient.

Reset Button Location On Blueair Air Purifiers

Except for some units in the Classic E-series, the button that can be used to reset Blueair air purifiers is located on the control panel and is labeled. You can easily locate the respective reset buttons (filter replacement or timer button) for each model. 

In the Blueair models that are compatible with WiFi, such as Classic 505, 411+, E-Series, etc., you can look for filter reset buttons on the remote to easily access the controls. 

Blue Series

The reset button is the main power button and is usually located on the top of the unit.

Sense, Sense+ and Pro Series

Simply press and hold the red circle on the top display of your Sense(+) or Pro air purifier to reset it.


Press and hold the filter button to reset your Classic series purifier.


Toe reset DustMagnet purifiers, locate the airflow, or fan speed button, and press and hold it for 15 seconds.

When To Reset The Filter Light on Blueair Air Purifiers

Here are all the reasons why you may need to reset the filter on Blueair air purifiers (hint: not just when you change your filter): 

1. Clogged Filter 

Blueair models use premium-quality, original filters that provide maximum filtration. However, these filters have a specific capacity and become saturated after a few months. Once clogged, they become incapable of efficiently trapping more contaminants, which makes replacing them necessary. 

Unlike many other air purifiers, Blueair filters cannot be washed, but you can vacuum them to remove dust and debris. However, this doesn’t necessarily prolong filter life, and you will still need to change the filters every 5-6 months. 

Blueair air purifiers have a filter replacement indicator that will notify you of a clogged filter by lighting up orange/yellow or red. After changing the filter, you must reset the light and the filter timer to use the unit again. 

2. Improper Filter Placement 

The filter light in a Blueair air purifier can also light up when the filter is placed incorrectly. For optimal filtration, it is crucial to secure it in its correct position. After removing the pre-filter (Blue Pure Series) and grille, take the Standard HEPASilent filter out and slide it again until secured in place.  

Afterward, reset the filter light to ensure the filter is inserted correctly. 

3. Internal Technical Issues 

Filter lights are an essential filter lifetime counter and are crucial to ensure adequate air purification at all times. 

If you have recently replaced your filter, and the filter replacement indicator is showing red or orange light, it may be due to some technical glitches within the system (they are only appliances after all). In this case, you can reset the purifier to see if it resolves the problem.  

4. After Repair 

Blueair air purifiers are electronic units and can malfunction due to various reasons like incorrect wiring, improper filter position, disproportionate size in relation to the room, dust within the system, obstruction in fan movement, etc. 

After the necessary fix, you need to reset the entire system to get it to work properly again. In the process, you will also need to reset the filter light.  

5. After Maintenance 

Maintenance of an air purifier is imperative to keep it running for years and more importantly, to remove contaminants from your indoor air effectively. Cleaning the entire unit at least once a month, and getting it inspected every few weeks for cracks, obstruction, possible damage to its components, etc., are all essential parts of the air purifier’s maintenance. 

A thorough inspection of the air purifier requires you to disassemble it. To use the unit again, you need to reset all its controls after reassembling.  

Blueair Filters 

There are different types of Blueair filters that you will need to replace (depending on your model) – here is a complete breakdown of them all:


The pre-filter is a generic textile filter found in the Blue Pure series. It is placed outside the main unit and traps large particles like dust and debris. 

Standard HEPASiIlent Filter 

Standard HEPASilent filters are a mechanical filter found in all Blueair models. It is made of polypropylene which helps remove 99.97% of particles and pathogens (measuring up to 0.3 to 0.9 microns).  

Electrostatic Filtration 

Blueair combines mechanical (HEPA) and electrostatic filtration into a patented HEPASilent Technology that is essential to all Blueair air purifiers. It negatively charges airborne contaminants, which then get trapped on the positively charged magnetic plates. 

During ionization, a trace amount of ozone is also produced, but sealed steel housing keeps it from escaping the system. 

SmokeStop Filter 

The smokeStop filter is an optional filter in Blueair air purifiers that removes gasses, chemical fumes, tobacco smoke, exhaust, etc. Its filter media is made of activated charcoal, which efficiently adsorbs various gasses, including ozone particles that may escape encapsulated steel chamber. 


These unique filters combine particle and carbon filtration media to collect gaseous and particulate contaminant matter. These filters are often used in combination for the HEPASilent filter.

Why Is My Blueair Filter Light Red? 

Blueair filter lights illuminate red when the filter has been in use for six months and needs replacing. The red light notifies the user to immediately change the filter (within the ensuing month)

In the Sense, Sense+, and Pro Series of Blueair, the filter indicator displays a red circle instead of a single red light.  

After changing the filter, make sure to reset the light to use the unit again.  

Why Is My Blueair Filter Light Orange (or Yellow)? 

Before indicating that the filter needs replacement (after six months), Blueair air purifiers display an orange or yellow filter light at the five-month mark. This reminds the user that the filter will need replacement soon (in around a month’s time).

You can place the order for a new Blueair filter when the filter indicator light turns yellow. Since the filter efficiency might reduce after 5months, you may also try vacuuming the filter for more effective air purification.  

How Long Do Blueair Filters Last? 

Original Blueair HEPASilent and SmokeStop filters last approximately six months of continuous use. This also applies to Blueair prefilters. DustMagnet ComboFilters require replacement after 6-12 months depending on the quality of the air.

Filters can last a little more or less depending on pollution and usage. You can keep track of filter life on Blueair air purifiers from the filter replacement indicator. 

Can You Reuse Blueair Filters? 

A Blueair filter can be vacuumed and reused if it has only been in use for a short period of time. However, for optimal performance, it is ideal to use a new filter every six months.  

How Do You Change a Blueair Filter? 

To change a Blueair filter, turn the unit off and detach the grill. Slide the Blueair filter out and place a new one in its position. Place the grill back once the filter is secured. For DustMagnet purifiers, remove the prefilters and slide out the ComboFilters. Change these first before replacing the components.

Here’s how to change a Blueair filter: 

  • Turn the unit off and disconnect it from the electrical supply. 
  • In the Pure Blue units, remove the pre-filter.  
  • Locate the air purifier grille and detach it to access the HEPA filter.  
  • Slide the HEPA filter out and insert a new one in its place.  
  • Place the grille back and replace the pre-filter if need be. 
  • Turn the unit on and reset it to use again. 

Note that an activated carbon filter is optional and used in place of a HEPA filter. Therefore, it is changed in a similar manner. 

Also, note that electrostatic filters last a lifetime and, therefore, do not need replacement. 

Theresa Orr

Theresa Orr holds a PhD in Earth Science and specializes in determining past climates from rocks using geochemistry. Her passion for clean water, soil and air drives her to provide easy to understand information for everyone to read.

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