There will be two on the chain one for the opening limit and another for the closing limit.
Sears garage door opener closes then opens again.
Hi in 2002 we purchased and had installed a craftsman 1 2 hp garage door opener model 139 53965srt.
Your garage door s logic board is the brain of your garage door opener.
Else repeat the process once again.
Erase all codes in your remote and then reprogram it.
Then during some cold winter day.
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.
It is important to perform the safety reversing test after adjusting the force settings.
If the garage door does not close completely or begins to close and then opens back up again the down limit switch needs.
Operate your garage door opener.
Close the garage door with the opener and watch it closely as it closes.
When the logic board wears out it can cause your garage door to close then open and vice versa without explanation.
This brain can wear out in time so you could need a replacement.
You have to keep adjusting till the garage door opens or closes fully without reversing.
Get logic board replacement.
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.
These may be metal plates screwed on to the chain plastic snap ons dojiggies with flexible metal arms attached etc.
When your garage door opens or closes when you haven t triggered the remote one possible cause is that a neighbor s remote was programmed at the same time as yours.
If this is a sears srt without external travel limit switches the internal travel limit is out of adjustment telling the opener to continue after the bottom of the door makes contact with the garage floor basically driving it into the ground until the force required exceeds what the safety system force is set at.
There may also be loose wire connections inside the button housing itself.
Until a year or so ago we never had a problem with it.
Look for trip arms or clips attached to the opener chain.
If that doesn t fix the problem check the wiring between the motor unit and the wall control.