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I’ve been having very odd intermittent problems with the Lift-Master garage door opener where I live. On the occasional hot afternoon, it has refused to close. It would click several times, and sometimes pop down and up. However, the problem invariably resolved itself after a half hour or so, which led me to believe that yet another deity of mischief had found his way to my dwelling. At first, I thought it was an overheating issue. I also found some clues in a forum, but they all sounded so complex. I read in the FAQ that the behavior is normal IF an obstruction is detected in the path of the sensors.

I looked into them, and had some trouble seeing one of the LED’s, because it was so bright, but sure enough, it looked fine. There were some spiderwebs near the sensors, so I swept those up, but no dice. Hmm… intermittent problem, behavior is similar to a sensor detecting an obstruction, and it only happened so far on hot summer afternoons.

A head-slapping realization came to me quickly, and I turned around to confirm the hunch. That LED that I couldn’t see because it was so bright happened to be in the direct path of the fiendishly aligned afternoon sun. At this precise time of day, that LED was just as bathed in direct sunlight as the sensor was. To test my theory, I stood outside the garage, blocked the sunlight with my silhouette, and hit the remote. The door closed with satisfaction. Or, more likely, I imagine that the door closed with contempt, as I walked away in satisfaction. It was kind of an Indiana Jones moment, realizing that fate has conspired to make an unusual alignment of cosmic rays interfere in your life in a very surreal way.

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