Look for red reset button. Might be bad run capacitor for
motor. Motor and chain may very well be dried out. So many
options.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
..


"fftt" wrote in message
...
On May 19, 6:14 pm, "James"
wrote:
This is a Craftsman unit, about 12 years old. It uses the
chain, but has
worked fine.

Today, the door would not go up and down. The unit buzzes
(loud) like the
motor is trying to run, but the chain does not move. Can
unhook the door
from the chain, and run it up and down manually, but the
drive motor seems
to be buzzing and not functioning properly.

Is the a home repair, or more likely a worn out unit
needing replacing ?

Thanks

James

check to see if the chain has jumped off the drive sprocket
& has
jammed the unit

next remove the chain from the drive sprocket & see if the
unit cycles
w/o load

cheers
Bob