Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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My garage door won't close ... starts to close but at different points it stops and opens again

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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.

Posted on Dec 31, 2010

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Posted on Jan 02, 2017

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1 Answer

The divisor has suddenly started stopping as it closes and then opens again. It can stop at any point. I can't see any sensors on the door at all.


I have seen this happen when the button the remote sticks down just a little tap on it puts it right then the door works properly till next time

Mar 11, 2015 | Building Materials

1 Answer

The down adjustment broke off


Check the micro switch that will be activated when the door reaches the closed position. It might need to be readjusted as it is supposed to be activated just as the door reaches the fully closed position to stop the further movement of the door. If it does not get activated at that point the door will try to open further but sence an "obstruction" and start opening again as a buildt in safety measure for protection against possible injury or damage to property.

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1 Answer

My Craftsman garage door will not close, only a few inches at a time


have a problem which returns every year when outdoor temperatures drop close to freezing. garage door will open only a few inches, then stops. I can close it and try opening it again... same result. After five or six such attempts it typically will open. Interestingly, when I push the switch button mounted on the interior wall of my garage and keep it pushed, the door will open, until I release the button at which point it stops opening.

Dec 19, 2013 | Building Materials

1 Answer

The sensor light are different colors


The sensors are seeing something directly in line with the beam between the 2 sensors, or your sensors are not aligned so they point directly at each other.

Jan 12, 2013 | Craftsman Sears Liftmaster Garage Door...

1 Answer

41a4315-7d remote opens garage door, but it won't close it; in order to close the door i have to use the wall mounted button and hold it down until the door closes all the way to the concrete. if i...


Check the door sensors. Make sure they are pointed at one another and the small light on each one is lit and not flickering. Tweak them a little. If you cannot get both lights to come on you have bad sensors.

Aug 24, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a LiftMaster garage door opener. It has started to act up a bit, and I can't seem to locate the problem. It opens just fine, but when we try to close it, with either the remote or the wall control,...


If the opener feels any resistance it will act like this.Make sure that the rollers on the door to frame are oiled well and turn easily, move in and out easily as well, you can also turn the screw to increase the resistance stop pressure.Oil the rollers well

Jan 22, 2011 | liftmaster Chamberlain Garage Door Opener...

1 Answer

My Sears Craftman garage door opener closes about 1/3,stops,and reverses.When I activate the remote again it stops rising,starts down again, comes down another foot or so,stops,reverses etc.,etc,etc It...


If the main light is flashing 10 times when the door reverses it is a door sensor problem. One may have been bumped so that they no longer point at one another. Make sure the small light on each sensor is lit and not flickering. If this isn't the case you might need to increase the down force a little. The control is on the back panel near where all those white wires go. Increase it about 1/4 turn and try.

Dec 16, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door doesn't close properly


I too am having the same issue. I replaced my console control because my garage door was unresponsive and that fixed that issue. Now I have to hold the button down sometimes double tapping the button and then holding it down to close it. I believe the first place to check is the limit switch. Look at your owners manual or get online help in adjusting that. If that does not work you may need a new logic board. As far as the sensors go, one is a sender and one is a receiver. They have indicator lights and when they are aligned they light up. Check those first as a logic board is usually alot more expensive. Check ebay though as I did as there are plenty of good used parts available. Just get the numbers off of your logic board so you know what to look for as far as model number and date of manufacture. Good Luck.

May 16, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Door hard to close have starts to close stops and starts to open again have to keep stopping and reversing door mult times to get closed


There should be two small white adjustment knobs on the side of the unit that you turn with a small flathead screwdriver. These are the load / limit adjusters.

What it happening is it think there is something stuck under the door (like a car hood, etc)

These adjustments are VERY sensitive, so be patient while adjusting them.

Feb 06, 2008 | Sears Craftsman LiftMaster Chamberlain...

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