Aprilaire 700 Vibration

Now that winter is coming to northeast Ohio my new Aprilaire 700 has started doing its job. It was professionally installed by the Carrier dealer who installed my new Infinity System in July of this year. I've noticed a vibration in the humidifier when it is running. There is no vibration when the 700 is not running so I assume that I'm dealing with an unbalanced fan shaft or blades. The Carrier dealer's work is of the highest quality and is not contributing to the vibration. Has anyone had this problem with a fan equipped humidifier? I believe that I should return it to Aprilaire for replacement. Thank you in advance for your time and any assistance provided.