Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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How do I allign electric eyes on bottom of door?

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These safety sensors do not have to be exact but need to point at each other. Make sure there is no obstruction like leaves... Also make sure the surface they are attached to is stable as well. To align them there will be a wing nut or some other type of adjustment on the sensor assembly. Thanks BB

Posted on Sep 03, 2010

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Posted on Jan 02, 2017

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The bottom freezer door right side is not closing all the way and causing ice to form in the freezer. This just started a few weeks ago.


YOU NEED TO CHECK UR DOOR SEALS AND READJUST UR DOORS AT THE HINDGES. IF U HAVE CHILDREN WHO LIKE TO SWING ON THE DOORS IT CAN CREATE A LEACK DUE TO BAD DOOR ALLIGNMENT
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Jun 20, 2015 | Refrigerators

1 Answer

Lights blinking 5 times and door won't close


generally, that means that the electric eye is blocked or misaligned and as a safety the door will not close unless you hold down the wired open/close button. or a broken wire in the electric eye wiring.

Mar 16, 2015 | Building Materials

1 Answer

Why is it my garage door will open and close on it's own. It will go up and down without pushing either the car remote or the button in the garage. And this is an old opener it does not have the elect


Well one I would suggest you upgrade the opener if it has no safety eyes. However its most likely a dead short in the electrical wiring touching a piece metal or shorting on themselves. Run your fingers all down both wires going from the motor to the opener on the wall see there any knicks. If so replace the wires with 18gauge bell wire you can buy it any hardware big box store. If not the short in the motor itself.

Oct 19, 2014 | Building Materials

1 Answer

Broken electric eye on garage door opener. How to bypass it to open door


The eyes do not stop the door from opening - They only work on the close cycle.

If the door will not open at all it may have a broken spring. Try unhooking the door from the opener.

If it works manually try the opener with the door unhooked.

NOTE: holding down the wall button overrides the safety eyes. This is the only bypass available (you need to get a new eye to replace the broken one.

Hope this helps

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1 Answer

My refrigerator is making a loud summing sound when the doors are closed - when i open the doors it stops


tigthen and alligned the door screws together the shelves place it or arrange it possible of wiggle. then observe after.

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1 Answer

Garage door opener (1/2 hp model #139.53675SRT). Does not respond to door opener, vehicle remote or key pad remote. gives two quick buzzing sounds when any of these devices are pressed. Wiring from door...


The eyes should have a light on them. Either red or green. If they are green then the eyes are ok. If there is no light on either eye, then this is the problem. If the eyes are okay, then I would check the motor. Make sure that it is getting power. Another thing that you can try is to unlock the door from the opener and see if the opener will move the chain by itself. The door could be jammed.

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2 Answers

Garage door opened, won't close


If you can press and hold the wall button and the door will go down, you have a photo eye issue. Check the photo eyes at the bottom of the door.

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