Blue Air purifier Red Light? (Easy Fixes)

A red light blinking on your Blue Air purifier can be annoying and worrisome, but it does not necessarily mean that your unit is broken or useless.

It’s just an indicator of a filter or sensor issue!

In this article, I will break down how you can fix this issue in just following a few simple steps.

Let’s dive in…

What does Red light mean on Blue Air purifiers?

What does Red light mean on Blue Air Purifier?

If you see a red light flashing on your Blue Air purifier, it usually means one of three things: either the filter is all clogged up with dirt and dust, the filter sensor is blocked, or the device has run into a temporary issue.

But there’s more to it than just red light. The color of the LED light can change from blue to yellow to red, depending on how clean or dirty the air is.

Here’s what each color means:

  • Blue: The air quality is good, and the purifier is running at a low speed.
  • Yellow: The air quality is moderate, and the purifier is running at a medium speed.
  • Red: The air quality is poor, and the purifier is working hard at high speed.

Sometimes, the light might blink or flash, indicating a problem with the unit or the filter. The blinking pattern can vary based on the model and the issue.

Here are some common scenarios:

  • Blue light blinking: The unit is in standby mode and not actively purifying the air.
  • Yellow light blinking: It’s a sign that the filter needs replacing soon.
  • Red light blinking: Either the filter requires immediate replacement, or there’s a malfunction in the unit.

How To Fix Blue Air Purifier Red Light Step-By-Step

Key Takeaways:

  • Check the filter condition.
  • If the filter is dirty or broken, clean or replace it.
  • If the red light persists after cleaning or replacing the filter, proceed to the next step.
  • Press and hold the main button (sometimes labeled “filter”) for 10 seconds.
  • The red light should turn off, indicating the issue is resolved.

Here are the detailed step-by-step guidelines;

Step 1: Clean the Pre-filter

how to clean blue air purifier filter
Picture on “How to clean the pre-filter”

According to the Times of India, a clogged or damaged filter might cause an air purifier to stop functioning or to start behaving incorrectly.

Although there are other potential causes for why it can stop working, a damaged or clogged filter is the big culprit.

So, before you do anything else, try cleaning the pre-filter. To clean the Blue Air purifier pre-filter, follow the steps shown in the above picture.

Step 2: Power cycle your Blue Air Purifier

reset blue air purifier

You have just cleaned the filter or even replaced the old one with a new one, but your Blue Air purifier still displays the red light!

What could be the issue?

OK relax! First of all, you don’t need to worry about it. It’s just a software glitch in your device and can be easily fixed through a reset.

Here’s how to do that:

  • Turn on the device.
  • You will see the filter indicator shining red. Don’t worry!
  • Now press and hold the main (in some cases “filter”) button for about 10 seconds.

After 10 seconds, the red light will stop shining and turn white. Now continue using your device.

Related: Blue Air Purifier Orange light issue! How to Fix?

Step 3: Let the device cool down

blue air purfier red light fixing guide

The red light may also flash when the purifier gets too hot. Overheating is a serious threat that can not only affect the functionality of your air purifier but also cause irreparable damage.

Several factors, including a faulty power source, malfunctioning internal components, and filter obstruction, can lead to overheating.

However, not all models meet these criteria. Most of them include a built-in safety feature that activates if the purifier runs for too long or gets too hot.

If the “clean filter” indicator is still flashing after resetting the device, check whether the device is overheated or not. If it is, let the device cool down for at least 60 minutes. After that, turn on the device and your problem should be solved!

Step 4: Clean the filter sensor

The air quality sensor in your device might be a bit dirty or not working properly.

This little part checks how much bad stuff is in the air and then changes how fast the fan works based on what it finds.

If this sensor is dirty or broken, it might not do its job right and could make the red light come on when it shouldn’t.

To fix this, take off the back part of the unit. Then, use a dry cotton swab to gently clean the sensor and get rid of any dust or dirt that might be in the way. Be careful not to harm it or make it wet.

Once you’ve cleaned the sensor, plug in the unit and check if the light changes color.

Step 5: Replace the Filter

blue air purifier flashing red light

When was the last time you changed the filter on your Blue Air purifier? Did you change the filter within the last six months?

I am sure you haven’t changed its filter in the last six months.

But did you know that Blue suggests that users should change the filter every 5-6 months?

According to Blueair, you should be serious about the filter and must replace the filter at least two times a year to get optimal functionality.

So as a last option, try replacing the filter with a new one. Follow the below video guide to replace your Blue air Purifier filter.

Use only genuine Blue air filters compatible with your model to ensure optimal performance and efficiency.


Q. Nothing worked! Still, my Air Purifier is showing red light!

If none of the above methods work for you and your Blue Air purifier still displays red light, you should contact Blueair customer care for further assistance.

But if the warranty of your device is invalid, visit your nearest electronics repair shop and ask them to look into it. Hopefully, they will help you to fix the issue!

Q: My Blue Air purifier is flashing red light, but I recently replaced the filter. What should I do?

If you have recently replaced the filter and the red light persists, there may be another issue with the purifier.

Check if the filter is correctly installed, ensuring it fits securely in place.

If the problem continues, reach out to Blue Air’s customer support for further assistance and troubleshooting guidance.

Q. How often should I clean my Blue Air purifier filter?

If you have pets or live in a dusty area, you may need to clean your Blue air purifier filter more often than the recommended one every two to four weeks.

However, if neither of these applies to you, the general rule is to clean your filter every two months.

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