I’m finally getting around to futzing with our new home’s garage door opener, which was advertised as non-functional when we bought the house. But it’s non-functional in a very unusual way: it will go up with no problems, but it doesn’t go down unless I hold down the button the entire way. Otherwise, if I just press-and-release, the door goes down maybe an inch and stops.
If I unlock the door from the track, I can lift it up and down with no problems at all. I adjusted the power dials on the opener itself, but it doesn’t seem to be a “power” issue; lifting the door’s harder than dropping it, right? And why would it work fine when I hold the button down?