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What is a photo-eye sensor? You’ve probably seen the small boxes attached to your garage door’s side rails, low down on either side, but do you know what purpose they serve, or how to fix them if you have a problem? This is one of the most common problems that we get called in for, and luckily in many cases it’s a problem that we can fix over the phone. So if you want to know how to fix your sensor or to learn why your photo-eye sensor is important, keep reading!