Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC
Liftmasters have a safety sensor near the floor on each side which will keep the door from closing should there be an obstruction, such as a rock, bike, or a child. This is government regulation.
In your user's manual there are instructions on how to adjust this if you have just installed it.
I think you would have noticed if there was something, even a rock, in the way. So, I looked on the LiftMaster website for troubleshooting advice on their doors. There are several ways to solve this problem. Here's the webaddress: http://www.liftmaster.com/consumerweb/service/faq
At that site you'll also find a customer service or contact link. If their suggestions don't work, get in touch with them.
If this webpage doesn't open up for you, please reply back and I will give you the information.
I hope this helps. If it does, I'd appreciate your vote or comment. Thanks for visiting fixya.com
Posted on Apr 11, 2011
Are the sensor eyes adjusted correctly??? if one eye is off as if it was bumped the unit will not operate correctly, near the door base are 2 eye-sensors,one eye is the beam eye(transmitter) and the other eye(receiver)if they cannot communicate(send beam/receive beam) it will perform poorly if at all,(CHECK ALL CONNECTIONS AS THESE CONNECTIONS TOO, IF FAULTY CAN DO THE SAME)
Posted on Apr 11, 2011
There are sensors that have to see each other in order for the system to work. If the beam are not aligned, it will cause the door to go to the open position and it sounds like the sensors are out of alignment. When the door is closing, it moves a sensor slightly and this breaks the beam and the door reverses and opens. Work the sensors so that they are both aimed perfectly at each other. There may be an amber light that will change to a different color when the sensors are aligned.
Posted on Apr 10, 2011
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Posted on Jan 02, 2017
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