If there is something in one of the tracks obstructing the free movement of the rollers the garage door can stick open.
Garage roller door stuck open.
When you know there is no damage to the door you can close the garage door by disconnecting the door from the electric opener.
Your garage door works because the garage door opener unwinds or winds the torsion springs pulling or pushing the garage door with rollers along a track.
However the rollers do need to be put back on the track which should be done by a professional.
A door that is stuck halfway open is a security risk allowing access to the garage and the home if it.
If the door still does not budge the problem may be with the tracks rollers or springers.
Do not attempt this if the door is wide open.
If this happens look for a screw on the motor unit to adjust the sensitivity of the opener.
Because of the potential danger of broken parts you should inspect the garage door for damage before attempting to close it.
How to troubleshoot a garage door that won t open.
Take a few minutes.
Garage door doesn t open in winter.
This is best for when the door won t open or if it close to the ground anyways.
Especially in winter when rollers sometimes get stiff the door opener might be refuse to open.
In order to fix this you ll want to make small changes to the close limit setting until the door opener knows to stop once the door has reached the floor.
It will come crashing down and could cause some damage.
If your garage door is closing fully and then reversing to open again then it may be due to a problem with the close limit switch.
Sometimes a garage door that lowers just fine will fail to open especially in winter.