Loosen the two terminal screws on the side of the opener where the bell wire attaches using a screwdriver.
How to test for a bad garage door opener switch.
Depending on the model most work by connecting two to four wires onto terminals mounting the device on the wall and then plugging the unit into an electrical outlet.
Okay now that you know some of the common signs of garage door sensor malfunction you re ready for the next step troubleshooting.
A wall console unit for a garage door opener is not a complicated device so it s fairly simple to troubleshoot when something seems to go wrong.
Your garage door opener will look for a new remote signal press the button on your remote so the opener can pick it up and then the opener will store the new code.
When the garage door opens about halfway or 5 feet from the ground and stops the up limit switch needs to be adjusted.
Before you go looking to bend metal or replace parts you ll want to first check if the problem is as simple as a corroded switch contact.
Open the garage door and watch it closely as it opens.
If your opener seems to overrun the switch and just keeps trying to pull the garage door up or down after it reaches the end of travel you might assume that it missed the switch or was moving too fast.
Locate the bell wire that connects the wall switch to the garage door opener.