Clutter or obstructions that block the sensor are the first problems to look for if your door won t close or in extreme cases open at all.
Garage door chain working but will not close.
Like mentioned above there are two lenses one on each side.
If something is blocking the safety beam then the garage door will not close.
First check the sensor lights.
Depending on the brand.
The motor will run but will not move the chain.
The majority of garage doors manufactured since the early 1990s are equipped with this safety feature.
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Another thing that can prevent your garage door from closing are obstructions that are blocking the lenses.
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.
If your garage door won t close all the way the problem could be due to a blocked photo eye.
The photo eye components consist of two pieces that align face to face across each side of the garage door roughly four feet above the ground.
If the motor hums but the chain doesn t move that indicates a problem with the motor.
In most cases the cause will be a stripped gear or a chain that has come off the sprocket.
Most garage doors have an emergency release typically a red pull cord that allows the door to be opened and closed manually.
When the cord is pulled the motor is disengaged from the chain.
If this is the case the motor will run but as the chain isn t where it should be it can t generate the lift to open the door.