Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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My door opens with the remote no problem however, it does not close and light seems to flicker on and off

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Take a look at the back of the unit and you will see a small yellow LED light. It will blink a certain number of times, which will indicate the fault it has acknowledged. Count the number of blinks, then look at the owners manual for the fault code in the troubleshooting section of the manual.

Posted on Jun 27, 2009

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I have a 3/4 horsepower liftmaster garage door opener, both the remote and the wall button won't close the garage door but both will open the garage door. however, the garage door will close if I hold...


If when closing the door it reverses to the open position and the main light flashes 10 times it is a door sensor problem. Make sure the small light on each sensor is on and not flickering ever so slightly. (check closely) Tweak them a little even though they may seem to be okay. Check for 5vdc between terminals 2 and 3 on the rear of the motor unit. If there is no voltage or if it is greater than 6vdc the logic board is bad.

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Is your door jammed or could the door be moved smoothly? If not then the motor might not be able to start and it flickers, try to press "+" for open or close (depends on whether the unit is going to close or open the door) once at a time and try to remote it, this will increase the open/close force and may overcome the issue.One more thing, do the photo-eye sensors give unobstructed with good indication?

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Check your 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 work you have a bad sensor.

Jan 01, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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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 bit. If you cannot get both lights to come on you have a bad sensor.

Nov 05, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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If the main lights flash 10 times when you try to close the door 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 03, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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If the main light is flashing 10 times when you try to close the door it is a door sensor problem. Make sure the small light on each one is lit, not flickering and that one is not dimmer than the other. Tweak them a bit if necessary.

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1 Answer

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If when you try to close the door with the remote it starts down and then the main light flashes 10 times and the door reverses to the open position it is a door sensor problem. Each of the sensors has a small light that should be lit and not flickering. Tweak the sensors a bit. If you cannot get both lights to come on you have bad sensors.

Sep 29, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

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Check to make sure the door 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 then your sensors have failed.

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1 Answer

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If the main light is flashing 10 times when the door reverses when closing it is a door sensor problem. You can override this with the door control but not with a remote. Make sure the door sensors are pointed at one another and the small light on each one is on and not flickering.

Jul 07, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Remote opens door but will not close door (Liftmaster)


If when you try to close the door with the remote the main light flashes 10 times and the door reverses to the open position you have a door sensor problem. Usually it is because one of them has been bumped and is no longer pointed at the other one. If they are pointed properly they will each have a small light that is lit and not flickering. Tweak them a bit. If this doesn't work and the lights are not on you most likely have bad sensors.

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