Place a stepladder beneath the box portion of the garage door opener.
Lower limit switch garage door.
Measure the height where the door stops while it is being opened.
Having made any adjustments test the safety reversal system.
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The garage door limit switches may need to be adjusted.
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Most devices need an adjustment when they re not working well.
Test your garage door if the up and down travel limits are set incorrectly the safety reversal system often fails and people especially children could be injured or killed.
First locate the limit switch.
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Use a ladder to get there and get ready to make the necessary adjustments.
The garage door opener is the same way.
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If the door simply stops short of the floor the likely culprit is the down limit switch.
The contact metals for both the limit switches and light sockets are flimsy and tarnish very easily.
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There is the up switch and the down switch.
Using a flathead screwdriver turn the down limit switch adjustment screw on the side of the garage door opener counterclockwise one full turn for every 3 inches you need the door to lower so it closes all the way.
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The limit switches allow you to adjust the function of your garage door.
Lay a 1 1 2 high or 2 x 4 laid flat object on the floor and see whether the door reverses.
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Open and close the garage door.
Limit switches look like two white knobs and you can usually find them on the garage door tracks.
When the garage door opens about halfway or 5 feet from the ground and stops the up limit switch needs to be adjusted.
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The limit switch contacts and the light sockets for that matter are made of very cheap materials on my 2003 chamberlain garage door opener.
It is also possible that the limit switch is located in the opener mechanism.
If you can t find it there consult your user manual for reference.
On certain garage door models the limit switch is located on the tracks.
Have a helper steady the ladder.
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If the problem remains continue adjusting the down limit switch until the door operates normally.
It may be obvious when you examine the door what type of limit switches you have.
A door opener with a screw drive may have spring loaded switches that shut the motor off when the carriage hits them.
