Why do the lights on my garage door opener flash and my door will not close? The garage door opener is equipped with two safety features that may prevent the door from closing and cause the lights to flash. Door/Window Sensor monitors open doors, windows, garage doors. A garage door opener is a motorized device that opens and closes garage doors. Most are controlled by switches on the garage wall, as well as by remote controls carried by the owner. A quick-release mechanism is attached to the trolley to allow the garage door to be disconnected from the opener for manual operation during a power failure or in case of emergency.
Find error codes for your Craftsman garage door opener at Sears PartsDirect.