Same here - sounds like a noisy transformer

Otherwise works fine.

Mine is a belt drive model

Good to know, thanks for the post!

We just installed a Chamberlain garage door opener (belt drive) about 2 weeks ago. When we first installed it there was no buzzing... until about 3 days ago. Everything still works fine though.

Has anyone found a solution or a reason for this?

Same thing here. Buzzing that seems to be growing louder. I'm going to have the installer come back out and see if they can fix it. Very annoying

i have a liftmaster belt drive which is made by chamberlain. same noise. i repair garage doors for a living and didnt even bother with it, but i think its a stuck relay. if it is, then its on the circuit board and should be looked at by a pro.

Same here - noisy transformer

Just turn up your music - and it goes away