Smaller doors often have just one spring.
Garage door is lifted off ground.
The trolley is connected to the door and moves as it opens and closes.
The emergency release cord is the red rope that hangs from the garage door trolley.
This brain can wear out in time so you could need a replacement.
To help lift a heavy garage door the springs apply twisting force to the torsion tube.
Drums at the ends of the tube act as reels winding up the cables connected to the door.
If one of the photo eye sensors are malfunctioning it will begin to blink rapidly.
Move the garage door up and down until you find a place where the door stays suspended when you let go.
If that point is more than four feet or less than three feet above the ground you will need to balance the door.
When the logic board wears out it can cause your garage door to close then open and vice versa without explanation.
Get logic board replacement.
If the lift of the springs is greater than the weight of the door the springs will lift the door off of the ground.
Your garage door s logic board is the brain of your garage door opener.
The photo eye sensor for a garage door opener is typically placed approximately two inches off of the ground.
The most common problems with this system are broken springs or cables.