Burnham 210

I have burnham alpine 210 . It howls and groans so loud I have to turn up my tv and can hear it on the second floor. I have had the O2 checked and adjusted . That didn't work. Checked gas pressure. Ok. I have read many post and it sounds like this problem has happened before , however I never seem to read about a solution aside from the O2. They burnham rep just keeps shrugging me off. i am at wits end. Any help would be appreciated