Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC
I need an owners manual
Posted by Anonymous on
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Posted on Jan 02, 2017
check to see if your ant. is up inside of the cover it's a little black wire that hangs outside of the operator shiould be about 6 inch.
Posted on Jun 07, 2009
is it little buttons on the remote change the buttons on the back of your operator to the same has the ones inside your remote. or if it's a newer one you can hold the square button of the back of the operator in for 8 secs. then after that you push the button and let go and then push the button on your remote. done
Posted on Jun 11, 2009
wI have never heard of this problem. you have to hold the button on your wall in to close the door. no way this is not right something wrong with your board insid the opener. get help from a pro. I would love to see this been doing this for 20 years never heard of this.
Posted on Jun 20, 2009
Hello, friend, W/D here.
I saw your post; I haven't seen the one you referred to. I have had similar issues to your's and here's what I did:
Having to hold the button down the entire time indicates that either your photoelectric eyes are out of alignment, or one of them has broken. If broken, the light on it will be out. Sometimes you can tighten the wire to repair, and tapping on it a bit won't hurt it. Adjusting the alignment is a bit of trial and error, but a string line helps to get them close. You can again judge by the light on the cells.
Not close from the car......started out good, got weaker... Same for me....new battery fixed it. I think I had to reprogram the remote, and the instructions were on the back of the lift motor in the garage....
Posted on Aug 14, 2009
Testimonial: "Thanks. When I looked closely,the amber light was lit fine, but the green light was flickering so I tapped it until it was solid - now it works fine."
make sure the eyes are clean and aligned if the opener thinks something is obstructing its path it will not close
Posted on Oct 10, 2009
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