Disconnect Electricity: Ahead of working on your garage door opener, disconnect the facility on the breaker or unplug the unit to prevent accidental operation and lower the risk of injuries or electrical shock. Indications of a defective limit switch consist of the door not opening or closing absolutely, reversing route https://youtu.be/wSkWTAdm-Gg?si=pR5EXdjVuNYjtHN7