Your garage door sensor works by having two photo sensitive devices on either side of the garage door.
Garage door get to bottom and goes back up.
Here s a rundown of some of the possible reasons this can be happening.
Measure the distance of the gap from the bottom of the.
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.
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.
Eventually the pressure sensor on the bottom of the door mistakes the ground for an obstruction and goes back up.
A careless or rushed parking job can cause the car s bumper to block the sensor.
The rubber on the bottom of the door should touch the ground but should not be smashed.
You push the button to close the garage door.
The best way to fix it is to adjust the stop time on the closer so that the motor does not lower the door so far.
Many times the malfunction can be due to a loose connection or broken wire.
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.
This is almost always the result of a dirty or obstructed safety feature.
Sweep the garage floors and look through the sidings to ensure that there are no objects to obstruct the door.
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.
It goes partway down reverses direction and goes back up again.
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.
Since the lack of power supply is a common problem check the wires around the sensor when the led lights are not flashing.
Your travel down setting needs to be adjusted.