It is a craftsman.
Garage door will not close unless i hold the button.
They can easily become mis aligned due to bumping twisting and loose mounting.
My garage door will open by just pressing the button once but to close it i have to hold in the button until it fully closes.
Depending on the brand.
If anything interrupts this beam of light the garage door will not close and the ceiling light on the opener mechanism will flash as mentioned in the previous step.
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.
One sends a beam of infra red light to the other.
First check the sensor lights.