Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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I have liftmaster garage door opener P/N 41A-5483-4. It worked normally. but all of sudden, when door closing, it reverses automatically at half way down, and garage door light bulb starts blicking 6 times. It worked normally randomly. Anybody knows why? By the way, one of door obstruction sensor light is orange, not green. Please help me on this

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Use the pull cord and disconnect the opener from the door. Operate the opener and let the carrier slide back away from the door. Is the carrier moving smoothly when disconnected? Next, lift the door by hand from the bottom to the top. Is it moving smoothly? If not, lubricate the axles of all the rollers on both sides of the door. Check the cable pulleys at the top sides of the door channel, lubricate them as well. Are all cables in all the pulleys, there are 4. After checking those things, there is a "up force" and "down force" adjustment on the opener, try increasing the "up force" by turning the adjustment in the direction of MORE force.

LiftMaster Garage Door Opener Frequently Asked Questions

Posted on Jan 03, 2011

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Which wireless keypad works with a 41A 3627 LiftMaster Chamberlain Garage Door Opener?


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HOPE THIS HELPS

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When I open the garage door it only opens half way and then stops


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Liftmaster garage door opens and shuts but when it reaches the closed position on the floor of the garage, it automatically reverses and opens back up again.


is there something jamming it travel of the door?
or does the travel distance of the door need adjusting?
How many remotes do you have?
do their batteries need a changing?
even with the power disconnected you should be able to close the door,
do this and check from there,
any of the switchs sticking down?

If it persists then call some one to fix it,
They are normally bullettproof if installed properly and servicing and lubracating them seems to be a good idea too,
some buildings shrink and contract more than others
Yours seem to be normal movement of the building structure.
winter and summer situtation.

check the adjustments on the travel,

Let me know the outcome thanks .....

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