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