Why do my garage door open again after closing? How can I fix it?
My garage door has two sensors, either of which can cause the door to open immediately after apparently closing:a force-sensitive switch that detects if the motor torque is excessive, typically tripped by incorrect adjustment, or by leaving a solid object in the way of the descending door (a car, for instance)an optical sensor that detects if an object is obstructing a lightbeam across the bottom of the door. That can trip because the sensor gets knocked out of alignment, or because there is an object in the way (even a leaf), or because something on the door itself gets in the way as it descends (I have foam padding on the lower door stiffener which can become dislodged).The force sensor can be recalibrated. But if it’s tripping when there is no object in the way, you have have other problems such as a broken spring or an idler wheel out of the track. The optical sensor can be cleaned and reset - mine has an indicator light to show it is “happy”.
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What does the garage remote use to open or close the garage? Is it IR or something else?
Garage remotes transmit on a frequency spectrum range between 100-400 MHz and most of the transmitter/receivers rely on hopping or rolling codetechnology. This approach prevents perpetrators from recording a code and replaying it to open a garage door. Since the signal is supposed to be significantly different from that of any other garage door remote control, manufacturers claim it is impossible for someone other than the owner of the remote to open the garage. When the transmitter sends a code, it generates a new code using an encoder. The receiver, after receiving a correct code, uses the same encoder with the same original seed to generate a new code that it will accept in the future. Because there is a high probability that someone might accidentally push the open button while not in range and desynchronize the code, the receiver generates look-a-head codes ahead of time. Rolling code is the same method of security used on the clickers of cars, and with some internet protocols for secure sites.
17021 Painted Bluff Way
Vail, AZ 85641
(520) 240-1779
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