Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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LIGHT FLASHES 10 TIMES

THE DOOR STARTS TO GO DOWN, BUT STOPS TRAVELING AFTER A FEW SECONDS.

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Reset safety lights

Posted on Nov 06, 2013

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SOURCE: door won't go down. Moves two inches and then

push the green button on the back of the motor drive now push and hold the remote button see if that fixes

Posted on Jun 22, 2010

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Door ajar light and interior light flash for about 30 seconds after turning car on


well most likecly you have a bad latch, since you do not mention the year, earlier models had a button on the door jam, later models is all incorporated in the door latch, usally if it is the latch, the door don't close with the remove and some times it doesn'h shut properlly.

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Hi...My garage door works from the remote but not from the wall. When I hit the wall switch, the door starts to move down, but then stops and the lights goes off and on for a few seconds. Until now, it...


If when you try to close the door the main light flashes 10 times and the door reverses to the open position you have a door sensor problem. Make sure they are pointed at one another and that the small light on each one is lit and not flickering. If you cannot get both lights to come on you have a bad sensor.

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Travels about 6" down and


If the main light flashes 10 times when the door reverses it is a door sensor problem. Make sure the sensors are pointed at one another and the small light on each one is lit and not flickering. If you cannot get both lights to come on you have a bad sensor.

Nov 04, 2010 | Sears Craftsman LiftMaster Chamberlain...

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My Chamberlain Liftmaster garage door opener will not stay closed. It will start down and about half way it will stop and reverse itself. At times it will work properly. When the bounce happpens the light...


Anytime the main light flashes 10 times and the door reverses to the open position it is a door sensor problem. Make sure they are pointed at one another and the small light on each one is lit and not flickering. If you cannot get both lights to come on you have bad sensors.

Oct 14, 2010 | Sears Craftsman LiftMaster Chamberlain...

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Door travels all the way to the floor but comes back up


If when the door reverses the main lights flash 10 times you have a bad or misaligned door sensor. If the door hits the floor and reverses but the main lights do not flash then the door is traveling too far. On the side of the motor unit you will find the 'down limit' control. Turn this in the opposite direction of the arrow printed on the cover. Some tweaking may be necessary.

Nov 13, 2009 | Sears Craftsman LiftMaster Chamberlain...

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The door will only travel a few inches and then stop and then goes back up. Or, it will travel to complete close, stop and then goes back up. Any thoughts?


If the main light is flashing 10 times when the door reverses it is a door sensor problem. Make sure the sensors are pointed at one another and that the small light on each one is lit. If you cannot get both lights to come on you have bad sensors.

Oct 31, 2009 | Sears Craftsman LiftMaster Chamberlain...

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The garage door opener is not cycling all the way closed, before returning fully opened. It is traveling about two feet down before stopping and gong back to the opened position. There is no obstruction in...


If the main lights are flashing 10 times it is a door sensor problem. If the lights are not flashing it is a bad RPM sensor board which is a small printed circuit board just in front of the motor. It can be purchased at Sears or any good door opener service company.

Sep 23, 2009 | Sears Craftsman LiftMaster Chamberlain...

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Problem with Garage Door - Stopping and Starting


If the main light is flashing 10 times when the door reverses it is a sensor problem. Make sure the small light on each sensor is lit and not flashing ever so slightly. The sensors must be pointed at one another for both lights to be on.

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

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your door travel screw is set to go too far on the downward travel. you need to set the down travel. It is set to go too far down. find the screw adjustment on the unit that says close and back off the screw a full turn until door stops short of floor. then start turning screw other way until door just touvhes floor.

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

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Remove the front panel. Tape the door switch to the closed position. If the thermostat is calling for heat the furnace should do the following: a light on the circuit board will flash and then the exhaust blower will start. A few seconds later (10-15) you should hear clicking at at the circuit board and an orange glow should be seen thru the small viewing port. A few seconds later the gas valve should open and the orange light will turn blue. If the blue flame only lasts a few seconds and then goes out, their may either be a blockage not allowing the flame to travel to all the burners and not allowing a flame sensor to sence flame, shutting down the unit. After a few cycles of not starting, the circuit board will flash a series of codes that you can read if you look on the back of the front cover. It will give you a starting point where we can research and come up witha more difinitive answer. Let us know what you find for codes.

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