Each type of garage door is going to have slightly different instructions. If the door did not come with installation instructions, try contacting the store you bought it from or the manufacturer of the door.
You can find instructions for garage door installation right on the instruction sheet that your garage door came with. You can also check websites such as ehow which will show you the step by step...
The first thing to do is to change the battery in the transmitter for a brand new one.
If it still doesn't work then, if you don't have any skills in diagnosing electrical faults - which may be true...
the garage door remote opens the door but when you try to close the door it goes down almost all the way and then reverses and opens again the problem may be the sensor beam is out of alignment. The...