When I started to preheat my Behmor yesterday I immediately heard a mechanical noise that sounded like grinding gears or a car that won't turn over. It was a slow sound that went up and down in pitch. Neither the drum nor chaff tray were installed and the little metal piece that turns the drum seemed to be turning ok. When I tapped on the side of the unit the sound stopped for a second or so, then came back. Not long after it stopped and I proceeded.
Any ideas on what this was and what I can do to fix or prevent it? I don't want anything inside to break. One person on SM's suggested it could be one of the internal fans.
Thank you.
