Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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How do you adust sensor on lift master garage. one sensor is yellow and the other is green

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They need to be facing towrds eachother

Posted on Aug 31, 2010

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I have 2 lift master garage door openers that are producing errors when you hit the buttons to open 2 different doors. 1. I get error code 11 (sensor blocked or miswired)-there is nothing blocking...


If your garage door is up, and you break the beam (by walking through it, for example), you will get the "SENSOR WIRING INTERMITTENT CONNECTION ERROR CODE 1-4 SEE USER MANUAL". This is normal. Both of my Liftmaster 8550 openers do this. It's misleading, but this is what I've found to cause this error.

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I have a Chamberlane Lift Master Professional I went to open it yesterday and it would not open. When the button is pushed the unit just clicks and the controller light is blinking 5 times then pauses and...


The code it is flashing is "RPM sensor or motor overload." It is not a door sensor problem. The RPM sensor is a small circuit board just in front of the motor.

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The model number will be on the opposite end of where you found the part number you listed. You can then call any Liftmaster dealer listed in your yellow pages.

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Door will not open or close with remote


What does a normal remote do with the lights?
Is yellow and green normal?

Aug 03, 2009 | Sears Craftsman LiftMaster Chamberlain...

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One of my garage door sensors is yellow while the other is green.


It means your sensors are properly aligned. Are you having a problem?

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Liftmaster 1/2 - Will not close


What usually happens is a sensor gets bumped so that they no longer are pointed at one another. They must be for the light on the second sensor to come on. Tweak them and see if you can get the light to come on. If you can't you either have bad wiring going to that sensor or the sensor itself has quit working.

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Garage door sensor light on one is green the other yellow. When they are lined up one stays yellow and one is green. When I point the yellow sensor away from the other one the green goes off. Do you think...


They are doing what they are designed to do. To work properly they must be pointed at one another and to tell when they are aligned the light on the receiving unit turns on.

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