Levoit air purifier not connecting to wifi
Cause 1 of 5The phone's Bluetooth is off, or the phone is connected to another Bluetooth device. Source: VeSync App Troubleshooting, p. 17
First checkMake sure the phone has Bluetooth turned on and is not currently connected to another Bluetooth device.
Causes and checks
The phone's Bluetooth is off, or the phone is connected to another Bluetooth device. Source: VeSync App Troubleshooting, p. 17
- Make sure the phone has Bluetooth turned on and is not currently connected to another Bluetooth device.
During setup the purifier must be on a secure 2.4GHz Wi-Fi network. Source: VeSync App Troubleshooting, p. 17
- Confirm that the Wi-Fi network is working correctly.
The Wi-Fi password may be entered incorrectly. Source: VeSync App Troubleshooting, p. 17
- Check that the password has no spaces at the start or end.
- Test the password by connecting another device to the router.
- If you type the SSID and password by hand, check both entries.
The signal between purifier, phone and router may be weak or disturbed. Source: VeSync App Troubleshooting, p. 17
- Move the purifier and the phone as close to the router as possible.
- Place the router higher and away from obstructions.
- Keep the purifier and router away from microwave ovens, refrigerators and other electronic devices.
A VPN or portal authentication blocks the connection. With portal authentication on, the purifier cannot reach the network and setup fails. Source: VeSync App Troubleshooting, p. 17
- If you are using a VPN, make sure it is turned off while setting up the purifier.
- Disable portal authentication for your Wi-Fi network.
All 5 causes checked. Contact Levoit Customer Support: 1-888-726-8520.
Service
If the checks above do not clear it, contact Levoit Customer Support: 1-888-726-8520, support.levoit.com. United States (Monday to Friday, 9:00 am to 5:00 pm PST/PDT). Source: Customer Support, p. 22
Other Core 400S problems
- Air purifier will not turn on or respond to buttons2 causes in the manual. First: the purifier gets no power, or the power cord is damaged.
- Airflow is significantly reduced3 causes in the manual. First: airflow is significantly reduced.
- Air purifier makes an unusual noise while the fan is on3 causes in the manual. First: the filter or the surface under the purifier may cause the noise.
- Strange smell coming from the air purifierStrange smell coming from the air purifier.
- Poor air purification quality3 causes in the manual. First: the room is larger than 403 ft² (37 m²), so air purification takes longer.
- Air quality indicator always stays red2 causes in the manual. First: the AirSight Plus Laser Dust Sensor may need to be cleaned. Dust blocking the sensor affects its accuracy.
- Air quality indicator always stays blue when the air is poorThe AirSight Plus Laser Dust Sensor detects airborne particles but cannot detect gas.
- Purifier shows offline in the VeSync app2 causes in the manual. First: the purifier is offline.
Sources
- User Manual, Core 400S smart air purifier. Arovast Corporation. Document HEAPAPLVSUS0162Y, revision A1-241202, 24 pages, en-US. levoit.com (PDF). Listed on the manufacturer's support page. Retrieved 13 November 2026.
Page numbers are the numbers printed in the manual. Where this page and the manual differ, follow the manual.