Of slack from the rail to the chain check your manual.
Garage door opener belt broke.
This can be easily replaced by a garage door service technician.
If you need to replace the belt in your belt drive garage door opener you might be surprised by how simple the task is.
Start by replacing the batteries in your remote.
As long as you have a guide to follow be it the one below or the one from your actual owner s manual you should not have too tough of a time repairing or replacing the belt.
Sometimes it s just a matter of changing the batteries in your remote or fixing a fuse in the fuse box.
Most chain drive openers suggest you tighten the chain so there s about 1 4 in.
The most common cause of a chain being loose and appearing broken is a broken gear and sprocket.
The gear and sprocket assembly is inside the cover of the garage door opener motor.
Step 1 turn off the power.
Over tightening the chain will put excess wear and tear on the shaft and gears.
If you re looking for an easy diy then this might be for you.
Garage door won t open all the way.
Next check to see if the opener has become unplugged.
You may have a chamberlain liftmaster garage door opener with a broken belt.