The higher the gear setting of the space heater, the louder the noise will be. We recommend turning down the unit speed to see if the noise will be reduced. Please also try the following steps 1. Take a short video for us to confirm if it is abnormal 2. Relocate the unit and ensure the heater is on a stable, secure surface 3. Try to apply lubricant to the base if the noise only happens while the heater rotates