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liftmaster Chamberlain Garage Door Opener Transmitter 300MC - Page 2 Questions & Answers
My 373LM Liftmaster remote does not work suddenly.
I would replace the battery anyway. Even with no use batteries drain over time. That's the easiest troubleshooting step and more than likely the problem. Once that's eliminated we can try harder solutions.
10/10/2016 10:18:40 PM •
liftmaster...
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Answered
on Oct 10, 2016
I Have a Liftmaster Professional
Hi,
There is a rope or string hanging down that releases the dog that hooks the door to the chain...if someone pulled that the door will not open. You need to pull down and back on the srting to relaese the dog and then push the door up to catch the chain...then the door will work again...
heatman101
Door closes and reverse itself
The most likely cause of this problem is that the door is unexpectedly hitting the ground before the shut off of the motor. It is possible that the door is also jamming which makes the unit think there is an obstruction. If there is no mechanical problem with the door itself, you can make adjustments to the up/down force and the up/down limits. These adjustments are at your lifter motor unit and you should check or download your particular manual. I have linked a video showing the basics for this adjustment.https://www.youtube.com/watch?v=GebkW96Sd_c
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