By the power of google I found this post. I have the same situation hz432 control panel with old power open power close dampers. I just had the hz432 put in last week and since my utility room is right below my bedroom I can hear the motors buzzing all night long as the power does not switch off to them after reaching the open position.
My question is this safe? Can I leave them and get used to the noise? Are they just going to burn out in a month or worse literally catch fire or something?
Should I call my hvac guy to swap them out for the ewc motors mentioned in this post right away or is it safe to sit on the issue for a while?