Blue Signature

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Troubleshooting

User Manuals & Replacement Filters

FAQ

How to Use Videos

Blue Signature Troubleshooting

I don’t notice a difference in the air quality when using the Blue Signature air purifier. Is it working? + -

Yes—the Blue Signature air purifier is actively working, even if the improvement in air quality isn't immediately noticeable. The unit continuously monitors airborne particles using its integrated laser particle sensor, which detects levels of PM1.0, PM2.5, and PM10. When in Auto Mode, the fan speed automatically adjusts based on real-time air quality readings to deliver optimal performance without unnecessary noise or energy use.

To ensure you get the best results, follow these expert setup tips:

Remove the plastic wrap from the filter before using the air purifier. Operating the unit with the packaging still on will prevent proper filtration.
Use in an appropriately sized room—not larger than the recommended capacity of 705 sq. ft.
Allow for proper airflow—place the purifier where air can circulate freely around it.
Maintain clearance—keep at least 4 inches (10 cm) between the unit and surrounding objects.
Close doors and windows while the purifier is operating to prevent new pollutants from entering.
Replace the filter when the indicator on the control panel alerts you—this is crucial for maintaining performance.
Follow routine maintenance as outlined in your user manual.

With these steps, you can be confident that your Blue Signature purifier is delivering cleaner, healthier air—even if it's working quietly in the background.

When I switch between PM1, PM2.5, and PM10 in the Blueair app, does it change which pollutants the air purifier targets? + -

Great question—and the short answer is: No, switching between PM levels in the app does not affect how your Blue Signature air purifier functions.

The Blue Signature air purifier is equipped with advanced laser sensors that continuously monitor PM1, PM2.5, and PM10—three key categories of airborne particulate matter. In the Blueair app, you can toggle between these readings to see real-time air quality data for different particle sizes. However, this only changes what is displayed in the app; it does not change the filtration behavior of the device.

Regardless of which PM level you're viewing, the air purifier is always operating at full efficiency, removing particles as small as 0.1 microns from your indoor air—including smoke, dust, pollen, and other airborne pollutants.

In short, the display helps you better understand your air quality, while the purifier handles the rest—automatically and effectively.

How do I factory reset the device? + -

To perform a factory reset on your Blue Signature air purifier, follow the simple steps below. A factory reset will erase all custom settings, including Wi-Fi connections, and return the device to its original default configuration.

Make sure the device is powered on
Plug in your air purifier and press the On/Standby button if it isn’t already running.
Locate the On/Standby Button
This is the power button, usually marked with a circle and vertical line (⏻) icon.
Press and hold the On/Standby button for 15 seconds.
Wait for Confirmation
The display will blink or reset to indicate the factory settings have been restored.

What Happens After a Factory Reset?

The device will forget all Wi-Fi and app pairings
Display lock, fan settings, and Eco Mode (if enabled) will return to defaults
You’ll need to reconnect via the Blueair app to use smart features again

When Should You Factory Reset?

If the purifier is not responding to controls
When changing Wi-Fi networks
Before transferring ownership to someone else
To clear persistent error states or connectivity issues

What maintenance is recommended for Blue Signature? + -

To keep your Blue Signature air purifier operating at peak performance, Blueair recommends a combination of routine cleaning, filter care, and safety checks. Below is a complete breakdown of the recommended maintenance tasks:

1. General Cleaning

Frequency: Monthly or as needed

What to Do:

Unplug the device before cleaning.
Use a soft, clean cloth to wipe down the top and exterior surfaces.
Avoid harsh chemicals, gasoline, or solvents, as these can damage the casing and electronics.

2. Pre-Filter Maintenance

Frequency: Every 2–4 weeks (more often if you have pets or high dust levels)

What to Do:

Vacuum using a soft brush attachment
Or wash it according to label instructions and air dry thoroughly before reattaching

3. Filter Replacement

Frequency: Every 9–12 months, or when the filter replacement indicator turns red

What to Do:

Follow the step-by-step replacement instructions in the manual.
After replacing, reset the filter indicator by:
Holding the Fan Speed button for 15 seconds, or
Using the Blueair app

5. Sensor Care (Air Quality Sensors)

Frequency: If air quality readings seem inaccurate

What to Do:

Power off the device
Clean around the sensor vents with a dry cloth or low-suction vacuum
Restart the unit

My Blue Signature air purifier won’t turn on. What should I do? + -

If your Blue Signature air purifier isn’t powering on, follow these expert troubleshooting steps to identify and resolve the issue:

Step 1: Confirm the unit is receiving power

Unplug the device, then inspect the power cable for any visible damage. If damaged, discontinue use and contact Blueair Customer Support.
Plug the power cable firmly into a working electrical outlet.
Press the On/Standby button or select a fan speed from the control panel (depending on your model).
Check for:
LED indicators lighting up.
Airflow coming from the outlet (place your hand over it to feel for moving air).

Step 2: Test the power source

Try plugging the air purifier into a different outlet.
Test the original outlet with another device (e.g., a lamp) to ensure it’s working properly.

Step 3: Check for firmware and power compatibility

If your air purifier is Wi-Fi enabled, connect it to the Blueair App to ensure it has the latest firmware update.
If using a power converter, confirm that the unit’s voltage requirements (see the rating label) match your country’s electrical standards.

Step 4: Perform a factory reset

Press and hold the power button until all LEDs blink four times—this may take 15–30 seconds depending on the model.
Wait—do not press any buttons. After about 5 seconds, all LEDs will blink twice to confirm the reset, including the red filter indicator.
The unit will enter Standby Mode once the reset is complete.
Re-connect the air purifier to the Blueair App, if applicable.

If your air purifier still does not turn on after these steps—or if you notice any signs of damage—please contact Blueair Customer Support. Our team is ready to assist you and ensure your device is working as it should.

User Manuals & Replacement Filters

Blue Signature SP4i

Blue Signature FAQs

What features are available on the Blueair app for the Blueair Signature? + -

The Blueair app gives you full control over your Blueair Signature unit with smart, intuitive features designed to enhance your air purification experience. Here's what you can do through the app:

Adjust Fan Speed
Manually select the desired fan speed or switch to Auto mode for real-time responsiveness to air quality.
Set Schedules & Timers
Automate when your unit turns on and off based on your daily routines and preferences.
Monitor Air Quality
Track real-time indoor air quality, including levels of PM1, PM2.5, and PM10 particles, to better understand your environment.
Receive Filter Replacement Reminders
Get notified when your filter needs replacing—never miss a maintenance cycle.
Control Multiple Units
Manage all your Blueair Signature units in one place, whether they’re in different rooms or separate properties.
Access Usage History
View historical data on device activity and air quality to monitor trends and optimize performance.
Adjust Brightness
Control the display brightness of your unit for comfort during daytime or nighttime use.
Enable or Disable AirSense Mode
Toggle AirSense Mode, which uses onboard sensors to automatically adjust fan speed based on current air quality.

Which filter does my Blueair Signature unit need? + -

Choosing the correct replacement filter for your Blueair Signature unit ensures it performs at its best. Here's how to determine the right filter for your device:

Purchase Filters for Blueair Signature
Particle + Carbon Filter: [Add Purchase Link Here]

Use the Built-In NFC Tag for Filter Matching
To make filter selection easier, each Blueair Signature unit includes a built-in NFC sticker:
Located inside the unit beneath the filter, the NFC tag can be scanned with a smartphone.
When scanned, it will automatically open a page with the correct replacement filters for your specific unit model. This removes all guesswork and ensures you get the filter your device is designed for.

Where can I find the serial number and model number on my Blueair Signature unit? + -

Identifying your device information is important for warranty registration, support, and purchasing replacement filters. Here's where to locate the key details on your Blueair Signature unit:

Serial Number & Model Number:
You can find both the serial number and the model number printed on a label located on the bottom of the device.
To view it, carefully tilt or lift the unit and check the underside for the printed label.

MAC Address:
The MAC address is found inside the unit, beneath the air filter.
To access it:
Remove the pre-filter fabric.
Unlock and take out the air filter.
Look for the label inside the chamber where the MAC address is printed.

NFC Sticker for Filter Identification:
Inside the device, you'll also find an NFC (Near Field Communication) sticker.
When scanned with a compatible smartphone, it will link you directly to the correct replacement filters for your specific model.
This ensures you're ordering the exact filter your unit requires, with no guesswork.

How do I reset the red light filter replacement indicator on my Blueair Signature unit? + -

When the red filter replacement light appears on your Blueair Signature unit, it means it’s time to change the filter. Once you’ve replaced the filter, follow these steps to reset the indicator:

Step-by-Step Reset Instructions:

Ensure the filter has been replaced.
Make sure you've completed the filter replacement process — including removing the pre-filter, installing the new filter with the correct orientation, and reattaching the pre-filter fabric.
Turn the unit back on.
Plug the unit back in and press the power button to turn it on.
Reset the Filter Indicator Light:

Manual Method: Press and hold the Fan Speed button (the fan icon) for 15 seconds until the red filter light turns off.

App Method: Alternatively, you can go to the Device Page in the Blueair app and reset the filter indicator digitally.

Why do I need to reset it?
Resetting the indicator ensures the unit can properly track the next filter lifecycle. If not reset, the red light may stay on even after a new filter is installed.

I don’t notice a difference in the air quality when using the Blue Signature air purifier. Is it working? + -

To ensure you get the best results, follow these expert setup tips:

Remove the plastic wrap from the filter before using the air purifier. Operating the unit with the packaging still on will prevent proper filtration.
Use in an appropriately sized room—not larger than the recommended capacity of 705 sq. ft.
Allow for proper airflow—place the purifier where air can circulate freely around it.
Maintain clearance—keep at least 4 inches (10 cm) between the unit and surrounding objects.
Close doors and windows while the purifier is operating to prevent new pollutants from entering.
Replace the filter when the indicator on the control panel alerts you—this is crucial for maintaining performance.
Follow routine maintenance as outlined in your user manual.

With these steps, you can be confident that your Blue Signature purifier is delivering cleaner, healthier air—even if it's working quietly in the background.