USA Air Purifiers Q&AAnswer
May 14, 2023 - 07:55 PM
Hello, yes that is usually a sign you need a new motor. Please take a pic of the serial number so we can verify the type of motor that is need since there are a number of 4000 style units on the market. Feel free to email me directly at contactus@usairpurifiers.com too. Are you comfortable replacing the filter?
Thank you,
Barb Lulay
USAirPurifiers.com
