There are four common problems with garage door sensors three of these homeowners can fix.
Liftmaster garage door opener goes down then back up.
Garage door only travels a little way and then reverses does your garage door only travel a little way 6 inches or so and then reverse.
Here s a rundown of some of the possible reasons this can be happening.
To fix this issue and get your liftmaster garage door opener working again follow these troubleshooting steps.
Your travel down setting needs to be adjusted.
To try and correct the problem make sure the eyes on the sensors are clean the wire connections are securely fastened at the sensors and motor head and the eyes are directed at each other.
Locate the limit switch adjustment either on the back of the opener or behind the light bulb s lens cover.
Close the door with either the door control or the remote control.
The garage door goes down then back up.
The garage door keeps going up and down.
Also try unplugging the garage door opener and re plugging the unit back into the outlet.
Pull the emergency release handle down and back towards the garage door opener.
But one of the more perplexing issues is when the door goes up and down by itself with no help from you.
It may be your garage door sensor.
Your garage door opens immediately after closing.
Your garage door opens when it hits the ground.
This acts as a reset and may reset the sensors.
This will disconnect the garage door opener from the door.
Turn the down limit switch screw clockwise one turn with a flat blade screwdriver if the garage door closes and then begins to open back up.
The garage door will automatically go in reverse.
Garage door opener keeps going back up.
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.
Automatic garage door openers are prone to a variety of problems most of which are fairly easy to fix with routine troubleshooting and maintenance.
Possible reasons why your garage door hits the floor then goes back up.