The exhaust fan comes on full bore when I power my Glowforge up and it never winds down. The lights will dim after a period of time, but the fan never slows down or idles.
It used to come on full blast right when it was powered up, but would slow down during head calibration, only going back to full speed when cutting materials. It would slow down again shortly after the cut was complete.
I’m not sure when this behavior started. I vacuumed out the exhaust port and checked my vent tube. I also disconnected my exhaust tube and fired it up that way. At one point, it would go back to normal after being unplugged for a few minutes and then plugged back in, but that no longer fixes the issue.