Levoit Core 300S purifier shows offline in the VeSync app
Cause 1 of 2The purifier is offline. Source: VeSync App Troubleshooting, p. 17
First checkCheck that the purifier is plugged in and has power, then refresh the VeSync menu by swiping down.
Causes and checks
The purifier is offline. Source: VeSync App Troubleshooting, p. 17
- Check that the purifier is plugged in and has power, then refresh the VeSync menu by swiping down.
- Check that the router is connected to the internet and the phone's network connection works.
Power outages, internet outages or changing Wi-Fi routers may cause the purifier to go offline. Source: VeSync App Troubleshooting, p. 17
- Delete the offline purifier from the VeSync app: swipe left on iOS, or press and hold on Android, then tap Delete.
- Reconfigure the purifier with the VeSync app.
All 2 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. 21
Other Core 300S 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 is out of position or the purifier stands on an uneven surface.
- 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 219 ft² (20 m²). The air purifier may not be as effective in larger rooms.
- 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 will not connect to the VeSync app4 causes in the manual. First: during setup the purifier must be on a secure 2.4GHz Wi-Fi network.
Sources
- User Manual, Core 300S series and Core 300S-P series smart air purifier. Arovast Corporation. Document HEAPAPLVSUS0073A, revision A2-240918, 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.