Check all of you conenctions and the installation of the new logic board.
Garage door begins to go down then back up.
There may be two nuts on one track.
Possible reasons why your garage door hits the floor then goes back up as is the case with so many issues at the home there s no one reason why your garage door closes then opens.
Consult your owners manual or a trained garage door technician in replacing the rpm sensor.
A careless or rushed parking job can cause the car s bumper to block the sensor.
Richard small engine technician replied 8 years ago.
Your garage door sensor works by having two photo sensitive devices on either side of the garage door.
It goes partway down reverses direction and goes back up again.
If the door had hit a stop it would not have reversed.
Another common cause of garage doors acting this way is a faulty rpm sensor.
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This is almost always the result of a dirty or obstructed safety feature.
Here s a rundown of some of the possible reasons this can be happening.
If the door reverses and the lights blink 10 times there s still a problem with the sensors or something tripped them on the way down.
When the opener is activated the screw rotates causing the nut to move until it reaches the switch.
Your travel down setting needs to be adjusted.
See if you can find a manual online and go throught the setup steps again.
Adjust it if needed and make sure the door is positioned in the middle of the 2 tracks.
When the opener reverses the screw turns the opposite way and the nut travels back.
Look at the top hinge on the door.
Sometimes the sensors will be in alignment and just as the door gets close to being shut it will vibrate enough to push one sensor off.
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.
If these can t see each other when the door is almost shut it will send a signal to the garage door motor to open back up.
One for the opening limit and one for the closing limit.
Then you have a binding problem in the door.
You push the button to close the garage door.
If the door hits something hard it will reverse.
Yes it goes all the way down the track when the door is disconnected.