In general, garage door sensors block the door from closing if there is an object nearby. If your sensors or garage door motor is blinking or your door doesn't close, it's a sign you could have faulty sensors. Magnetic Contact w/ 3 Wires for N.O./N.C. 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I called Precision late in the afternoon and was able to get an appointment first thing the next day. Our garage door had a number of issues and needed an overhaul. You’re seeing this ad based on the product’s relevance to your search query. Offers peace of mind and safe operation. The infrared beam from the garage door opener sensors isn’t able to be … MyQ Smart Garage Door Opener Chamberlain MYQ-G0301 - Wireless & Wi-Fi enabled Garage Hub with Smartphone Control, 1 Pack, Black. There's a problem loading this menu right now. Garage door sensors prevent the garage door from closing if there's something in the way. After viewing product detail pages, look here to find an easy way to navigate back to pages you are interested in. It also had a safety sensor issue that was preventing the door from closing. 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