Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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Our garage door opener is messed up. It keeps

Our garage door opener is messed up. It keeps getting stopping while going down.

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  • marionbagget May 11, 2010

    Does it stop at the same location ? Does it reverse after stopping ?

    Has any damage been done to this system ?



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If there is nothing in the path of the beam as the door comes down, then the electric eyes are off a bit in alignment. It takes very little to knock them out of alignment, and very little to align the again. You can turn them by hand, but make small changes. Look at them and aim for straight 180 degree sight line.

Posted on May 28, 2009


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I own a Stanley Professional 7100 Garage Door Opener and the chain fell off. I messed with the open and close nobs on the bottom not when I close it, it closes all the way but then opens again

The knobs that you "messed" with is most likely the UP and DOWN limits. If it opens like it should! Then ignore the "up" knob but, the down knob is the one your gonna want to turn to the - side of its opinion and not the + side whitch is already turned up too much, whitch is why as it is closing it retrieves back as it opens becouse the operator is sending the door too fare down..... so by dacking off the down limit knob a little at a time and trying to close it till it stops ounce it gets to the full close position...... the knobs should have indicators of arrows one with a arrow up and the other with one pointing down....

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My craftsman 1/2 hp garage door goes up only about

Release the door from the opener and operate the door by hand. Check the weight of the door. If it is heavy check the door springs. One could be broken. Also take another look at the gear you replaced. Did you use the lubricant on the gear? If not the gear will not last.

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1 Answer

Garage door keep stopping when going down.

On the rear of the motor unit near where all those white wires go you will find the 'down force' control. Increase this 1/4 turn and try. You may have a bad RPM sensor or misaligned door sensors depending on any other symptoms.

Nov 17, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Sears garage door opener only open half way going up..

this one is easy...there inside your garage door opener, the one on the top of your ceiling in your garage has little like knobs ..mine has a straight like screw driver circles attached to knobs. Round dials with screw driver like knobs on top of them...they are adjustable. your "tune" them until they just stop where you want them, don't forget to grease your chain, keep your tracks clean of dust, and make sure your safety "stops" are working properly so that if children are in the way, it will stop. Also..make sure there is nothing in the way of the track. If the sensor "senses" a block...that will also cause it to stop halfway. Now if you could tell me how to change my combination on my keypad...I'm all set.

Apr 15, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door wont close in cold weather

find force adjustment on logic board and turn clockwise A LITTLE to increase down force. Try to stop door. You do not want TOO MUCH FORCE as that is a SAFETY HAZARD.

Jan 12, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door close but motor keeps running

The close setting limit switch needs adjusted. Once it is adjusted it should work just fine.

Dec 24, 2008 | Sears Craftsman LiftMaster Chamberlain...

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