Coway Light Indicators Meaning: Red, Purple, Blue, etc.

Not every uncommon light on your Coway air purifier signals a problem. In fact, most of the time, it’s not an issue at all. Coway air purifiers feature a range of light indicators that represent different information, but it’s the air quality and filter reset indicators that often make people worried.

Coway air quality indicator red light
Coway air quality indicator red light.

Apart from these two, your Coway may also have indicators for WiFi connectivity, currently active features, fan speeds, etc.

Let me put things simple. If you notice a small indicator near the filter reset button lights red, that’s your signal that it’s time to replace the air purifier’s filter and nothing else

However, if your Coway has an indicator that lights in different colors like blue, purple, and red, it indicates the current air quality. So, there is no reason to worry about any issue with your device.

Coway’s Odors Light Indicator

It’s important to mention that not all Coway air purifiers are identical, and the colors of their indicators may vary. However, what’s common for all Coway air purifiers is the presence of an air quality indicator, which is always easy to see, so you can’t miss it.

This air quality indicator, as you can see in the image below, is the standard feature of Coway air purifiers:

Coway air purifier air quality indicator
Coway air purifier air quality indicator.

For example, the air purifier in the image above is the Coway AP-1512HH, and its air quality sensor has three different colors: blue for good air quality, purple for ordinary polluted air quality, and red for highly polluted air quality. 

Coway air quality indicator changing colors
Coway’s air quality indicator changing colors.

Other Coway air purifiers may have their unique color schemes for the air quality indicator. The Coway Airmega 300S/400S and 300/400 series feature an entirely different set of colors for their indicators, as you can see in the table below:

ModelAir Quality
400S/300SGood: Blue and Green
Moderate: Green and Yellow
Unhealthy: Yellow and Pink
Very Unhealthy: Pink and Red
400/300Good: Blue
Moderate: Purple
Unhealthy: Pink
Very Unhealthy: Red

The Coway Airmega 250/250S and Airmega Icon/IconS models also use different colors for air quality indicators. In these models, blue represents good air quality, green indicates moderate air quality, yellow signals unhealthy air quality, and red warns of very unhealthy air quality.

Filter Reset Indicator (Red Light)

In addition to the air quality indicator, every Coway air purifier features a filter reset indicator, primarily designed to light when it’s time to replace the old filter. 

Coway air purifier filter reset indicators
Coway air purifier filter reset indicators (HEPA and ODOR).

Typically, Coway air purifiers come with two different filter reset indicators: one for the primary filter (often a True HEPA filter) and the other for the carbon or pre-filter. These indicators are designed to up when the individual filter is ready for replacement.

Once you’ve successfully completed the filter replacement process, it’s important to reset the filter reset indicator. Doing so is a simple procedure, and as soon as you’ve completed it, the persistent red light will promptly disappear. That’s how you reset the Coway’s red light.

FAQ about Coway Light Indicators

What if the red air quality indicator light doesn’t change on my Coway?

If the air quality indicator is red, you should switch your air purifier to maximum fan speed and leave it that way until the air quality improves (and the blue indicator lights up).

How to fix the red light on the Coway air purifier?

A red indicator light is often a signal that it’s time to replace the filter. After you’ve installed the new filter, don’t forget to reset the indicator. Doing this will switch off the red light.

Final Conclusion

Overall, there’s no need to worry if you see a red or any other light indicator on your Coway air purifier. These lights typically don’t signify a malfunction or error in your device’s operation.

In most cases, these indicators function as straightforward reminders for filter replacement or air quality status. However, when the air quality indicator light turns red, it suggests that the air quality in your place is significantly worsening.

If you have any questions or problems with your Coway air purifier, please leave a comment in the comment section below, and I will do my best to answer it as fast as I can.


  1. Sunil Gupta November 23, 2023 Reply
    • Milan Antonic November 23, 2023 Reply
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