Our garage door opener seemed to produce the error message about a possible obstruction when the weather got really cold. We're in Minnesota and the temps dropped below 10 degrees. Maybe it's just coincidence, not sure. I've finally had time to look into a fix and found this forum. I followed the suggestion to unplug the opener for 10 seconds, plug back in and press the reset button on the side for 10 seconds (until it beeps) then open and close the garage door twice from the original opener mounted on the wall. Worked like a charm! It took longer for me to google an answer and find this website than it did to complete the task. I'll have to see if it continues to need syncing as the weather remains cold.