Even with regular maintenance garage doors can sometimes stick refusing to open or close.
My garage door trolley is stuck.
Some garage doors have a full lock system which enables you or anybody to lock your garage door from the outside by only turning the handle.
The trolley can become lodged against the stop bolt tab because the door has either opened or closed too far.
Weather damage and harsh impacts can also distort your garage door track.
The garage door opener motor will hum when attempting to open or close the door but is unable to travel due to being lodged against the bolt tab.
A door that is stuck halfway open is a security risk allowing access to the garage and the home if it.
Over time your garage door track can be damaged resulting in a garage door that gets stuck open.