Bob the Brewer wrote:

If I push the button on the remote control or on the wall control, it
starts going down, then immedaitely stops and goes right back up. It
doesn't go down more than an inch or two before stopping and coming
back up.

Might or might not move at all if it's the safety sensors. Worth a
look.

If it moves an inch or 2 and reverses, other posters could be right,
could be down force sensor, may need adjustment, or door could be
binding, or springs could need adjustment. Springs, I wouldn't touch
them myself, too dangerous.

Jerry