Step 1. Check the LED before troubleshooting
Press the button on your Atmotube PRO 2 once and check the LED. The color tells you what state the device is in — and whether the issue is connectivity-related at all.
LED state | Meaning | What to do |
🔵 Blinking blue | Ready to pair | Continue with Step 2 below |
🔵🟢🟡🟠🔴 Solid color | Healthy, showing air quality | Continue with Step 2 below |
⚪ Solid white | AQS data not yet available | Continue with Step 2 below |
🔴 Blinking red, 1× every 5s | Low battery (below 5%) | Charge the device, then try again |
🔴 Blinking red, 2× every 5s | Invalid timestamp | Connect to the app to sync time |
⚪ Blinking white | Device error | Restart the device, then retry |
🔴 Fast red blinking | Firmware update in progress | Wait for the update to finish |
⚫ No light at all | Powered off or fully drained | Charge for at least 30 minutes |
For the complete LED reference, see What does each LED color on the Atmotube PRO 2 indicate?
If the LED shows your device is healthy (blue, solid color, or white), continue to the steps below.
Step 2. Check Atmotube’s Status
Press the button on your Atmotube PRO 2.
The LED should light up:
Has light → Device is powered and ready.
No light → Charge your Atmotube before trying again.
Step 3. Make Sure It’s Not Connected to Another Phone
Atmotube PRO 2 can only connect to one phone at a time.
If the device is already paired with another smartphone, disconnect it there first.
Then try scanning again in the Atmotube PRO 2 app on your phone.
Step 4. Check Android app permissions
Granting Notification permission is essential for the background service to maintain a stable Bluetooth connection.
On Android 10 and 11, Location permission is also required for Bluetooth scanning to work. Go to Settings → Apps → Atmotube PRO 2 → Permissions → Location → Allow while using the app. Also make sure Location is turned on in your phone's system settings.
On Android 12 and above, Location permission is not required.
Step 5. If your phone cannot connect to Atmotube
Remove Atmotube from your phone’s Bluetooth settings
Android
Go to Settings → Connected Devices → ATMOXXXX → Forget
iOS
Go to Settings → Bluetooth → ATMOXXXX → Forget
Make sure the device is in pairing mode
Press the button five times until the LED starts blinking blue.Confirm the system pairing request when prompted.
Step 6. Restart Bluetooth and the App
Turn Bluetooth off and on again.
Close the Atmotube PRO 2 app completely and reopen it.
Try scanning again.
Step 7. Update the App
Make sure you have the latest Atmotube PRO 2 app installed from the App Store / Google Play.