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Why my garage door reopen while it hits the ground?

My garage door will automatically reopens after it hits the ground.?

can any one assist telling me how to fix the garage door or what may be wrong. More often then not I am left sitting in my drive way clicking the remote to my garage door hoping on the next close that it will stay closed. For some reason when it hits the ground, it automatically reopens. i have checked the child saft sensors and their is nothing obstructing them. What might be wrong, hwo can i fix this?

This is a belt drive garage door opener. The doro and opener are about 6 moths old.

Answer:

When your garage door opens and closes there are two switches that it trips (one for when it opens and one for when it closes). These will normally be by the belt drive casing or near the railing at the sides. These can be adjusted forwards or backwards to control how far the door opens and how far it closes. What is probably causing your problem is that the switch that gets tripped when your garage door closes is too far forward allowing it to hit the ground before it trips the switch to stop the garage door. Garage doors have a pressure sensitive mechanism on them for safety reasons. If the door hits an object when it is closing it will stop and raise back up. This is so it won’t crush a kid or a person if they happed to be under the garage door when it closes. Since your switch to stop the garage door is too far forward or possibly broken your garage door sensors think the door has hit an obstruction when it hits the ground and therefore it raises. If adjusting the trigger switch doesn’t work, you might try adjusting the pressure it takes to send the garage door back up. It could possibly be too sensitive. That adjustment should be located on the garage door motor. Only adjust that AFTER you have already tried moving the trigger to stop the garage door when it closes.