Sears garage door opener moves only 8 inches

It sounds like the opener may be having trouble with the limit switches. These switches tell the opener when the door has reached the fully open or closed position, and if they are not set correctly, the opener will stop and reverse. Check to make sure the limit switches are adjusted correctly and that the opener is connected to the door properly. If the problem persists, it may be necessary to consult the opener's manual or contact a professional for further assistance.

It is possible for a DIYer to troubleshoot and fix the problem with the limit switches on a garage door opener, but it will depend on the individual's level of expertise and comfort working with electrical equipment.

First, you can check the manual to see if it contains any troubleshooting guides or instructions for adjusting the limit switches. Then, make sure that the opener is properly connected to the door and that the limit switches are set correctly. If these steps don't solve the problem, you may need to seek professional help.

You should be aware that garage door openers are complex mechanical and electrical devices that can be dangerous to work on if you don't have the proper training or experience. If you're unsure about your ability to fix the problem safely, it would be best to contact a professional.

The tools you'll need to troubleshoot and fix limit switch issues on a garage door opener will depend on the specific opener you have and the nature of the problem. However, in general you might need:

A ladder: to reach the opener Screwdrivers: to adjust the limit switches or other parts of the opener A voltage tester: to check for electrical issues Adjustable pliers or pliers: to adjust the opener's chain or belt Adjustable wrench: to adjust the opener's tension A flashlight: to help you see into tight spaces A manual: of your opener with instructions It's important to note that most garage door openers are complex mechanical and electrical devices that can be dangerous to work on if you don't have the proper training or experience. If you're unsure about your ability to fix the problem safely, it would be best to contact a professional.