As these wires short against the housing the electrical impulse causes the door opener to activate.
Garage door opens intermittently.
You push the button to close the garage door.
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.
Locate and eliminate the source of the rf interference.
This is almost always the result of a dirty or obstructed safety feature.
If your garage door is closing fully and then reversing to open again then it may be due to a problem with the close limit switch.
Finally it s possible the garage door opener s motor.
Depending on the brand.
It s also possible that the circuit breaker fuse or gfci outlet powering the door opener circuit has tripped or burned.
As with many such problems the most common problem is the simplest one the motor unit has been unplugged.
Simply put if the descending door hits an object the motor detects the resistance and the door opens.
The garage door opener detects when it is getting too difficult to raise the door and automatically shuts down.
There may also be loose wire connections inside the button housing itself.
Adjust the degree of upward force which is one of the two adjustable screws on most garage door openers.
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 the remote works only when held within a few feet of the motor unit rf interference is probably the problem.
Likewise if the beam of light between the floor sensors is broken the door will not shut.
First check the sensor lights.
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.
When the garage door opener works intermittently the logic board may be experiencing radio frequency rf interference from nearby sources such as security lights ham radios and some electronics.
Led lightbulbs are great but they may cause your garage door openers to stop working.
See all the details in this video.