I have had issues with my garage door not wanting to close depending on the time of day. I have a a north facing garage door and depending on the time of year and time of day, the sun can shine on the door sensors and interfere with them.

The door sensors are the little sensors that are attached near the bottom of the door rails. They are a pair and point at each other. If anything is between the sensors, then it will block the garage door from closing. On my opener, the door won’t even try to close or if it was closing and something got between the sensors, it would go back up. The light on the garage door unit flashes three time until the issue is resolved.

One of my sensors.
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