I purchase this unit a couple of days ago putting it all together was very easy followed the instructions for start up got it to 150 now here's my question when I whipped it up to 350 it makes a pulsating noise that's kind of loud that did not quit though out the entire brake in period followed the instructions for turn off. Then later the same day I wanted to cook something simple so I decided on some grilled veggie followed instructions for start up got it to 150 then whipped it up to 350 again did the same loud pulsating noise though out the entire time can anyone tell me if this is normal or am I doing something wrong? By the way the veggies came out awesome.
