Disconnect Electricity: Just before working on your garage door opener, disconnect the ability on the breaker or unplug the device to circumvent accidental Procedure and reduce the risk of damage or electrical shock. Just after extreme temperature shifts or mechanical repairs, re-Look at the garage door opener travel limit settings. https://youtu.be/wSkWTAdm-Gg?si=pR5EXdjVuNYjtHN7