It is important to understand if it is an electronic or mechanical vibration. In most cases, the cause is often due to improper installation. We recommend having your installer re-attend to check the installation. In particular that the ducting is installed correctly (i.e. not kinked and allowing for free airflow) and that construction or building rubble hasn't entered the rangehood during installation.
If after you have checked, the problem persists, you should contact our After Sales Service Team on 1300 11 4357 for further analysis.