They are misaligned this is the most likely problem and the most common issue with garage door openers.
Garage door closes and reopens immediately.
As these wires short against the housing the electrical impulse causes the door opener to activate.
It goes partway down reverses direction and goes back up again.
If it closes before that distance has been traveled it thinks something is wrong and it reopens to help prevent any damage or safety risk.
If the garage door does not close completely or begins to close and then opens back up again the down limit switch needs.
You push the button to close the garage door.
If the door closes while holding the button pressed you are likely having one of the following issues with your safety sensors.
Close the garage door with the opener and watch it closely as it closes.
The symptom of this is a garage door that is in constant motion opening fully then immediately descending only to start the same cycle again.
Fast easy step by step process on how to properly program your garage door travel system.
The solution is usually one or more of the following.
This is almost always the result of a dirty or obstructed safety feature.
If it closes only partway the safety sensors are usually responsible clean the lenses or realign them and make sure there are no obstacles blocking the beam.
There may also be loose wire connections inside the button housing itself.
If you re craftsman chamberlain etc garage door opener is closing and then opening up its likely a common problem related to the stop limit mechanism.
If your garage door won t open or close the problem could be a bent track a broken torsion spring or a bad capacitor int he motor housing.