Just got a hovabator from a guy up the hwy for $15. I've read they normally make some noise but noone says how much, when, or how loud. When mine makes they noise it is when the fan/element is kicking in, or when it shuts down. It almost sounds like it needs to go faster to be quiet, like something is rubbing but only when it is slow. And it is Loud, I can hear it across the house loud. Is this just normal? If not, what parts do I need to order, I'm itching to get some eggs in there. Any ideas or things I could try or tell you to get a better understanding of where the problem is?