If you find the heater is vibrating, it is recommended that you first power off and unplug the unit. Follow these cleaning instructions in the video linked below. It is possible that there may be some accumulation of debris inside of the heater on the blade or blade shaft which is causing the excessive vibration. It is important to not that slight vibration is completely normal on a heater.
If this does not resolved the vibration concern, please feel free to contact one of our Support Heroes by chatting at www.lasko.com or via email at firstname.lastname@example.org to see if there may be another option to help. Please remember to never open your space heater.