Levoit Core 300S air purifier makes an unusual noise while the fan is on
Cause 1 of 3The filter is out of position or the purifier stands on an uneven surface. Source: Troubleshooting, pp. 15, 21
First checkCheck that the filter is properly in place with the plastic packaging removed.
Causes and checks
The filter is out of position or the purifier stands on an uneven surface. Source: Troubleshooting, pp. 15, 21
- Check that the filter is properly in place with the plastic packaging removed.
- Place the purifier on a hard, flat, even surface.
The filter is due for replacement. Source: Troubleshooting, pp. 15, 21
- Replace the filter. See Replace the filter.
The purifier may be damaged or a foreign object may be inside. Source: Troubleshooting, pp. 15, 21
Levoit Customer Support Stop using the purifier and contact Levoit Customer Support: 1-888-726-8520. Do not try to repair it. Contact: 1-888-726-8520 or support.levoit.com.
All 3 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.
- 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.
- Purifier shows offline in the VeSync app2 causes in the manual. First: the purifier is offline.
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.