Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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Installing 8 x 7 garage door, when they say left

Installing 8 x 7 garage door, when they say left side is that looking from the outside or the inside. thx

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INSIDE LOOKING OUT
STANDING IN THE GARAGE LOOKING OUT THE DOOR IS THE LEFT AND RIGHT THEY REFER TO.

Posted on May 26, 2010

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Posted on Jan 02, 2017

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1 Answer

Chamberlain troubleshooting


Check to see if sensors (eye) on sides of door are lined up, they need to be looking directly at each other. If that doesn't work change sensors, simple, install, hook up 2 wires per sensor, wire with line to same wire, blank wire to same blank wire and align so sensors see each other.

Jul 29, 2014 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have the chamberlain garage door opener. the door will not shut. the door travels to about 8 inches above the floor and then reopens. the door is just over one year old and has worked well up...


The sensor colors are correct. Try wiping the little eye sensors that point at each other for one thing and make sure there isn't something protruding from door that's coming into the patty of electric sensors.

Mar 14, 2011 | liftmaster Chamberlain Garage Door Opener...

1 Answer

My Chamberlain garage door opener only opens 8 inches.


Sounds like you have broken door springs or a bad drive gear. Take a good look at the springs and then remove the cover and look at the gear. It is white nylon and is just in front of the motor.

Sep 05, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door shuts down, need to press reset to get it to work


On the side of the opener you will find the down limit control. Turn this a bit in the opposite direction of the arrow printed on the cover. You will probably have to tweak it a bit to get it just right.

May 14, 2009 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Craftsman chain drive opener won't stay down


Check the down limit:
If the light bulb(s) on your operator are on the front and/or back, the limit adjustment screw is on the left side of the operator (looking from the back of the operator and facing the garage door).. If the lights are on the sides of the operator then the limit adjustment screw is on the left side (looking from the back of the operator and facing the garage door).

Check the up and down force: 
On your operator (the box that hangs from the ceiling). If the light bulb(s) on your operator are on the front and/or back, the force adjustment screw is on the back of the operator. If the lights are on the sides of the operator then the force adjustment screw is on the right side (looking from the back of the operator and facing the garage door). Turn the light blue adjustment screw with the up arrow to a higher number.


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

1 Answer

The up and down door


If you have a Chraftsman/Liftmaster check the down limit:
 If the light bulb(s) on your operator are on the front and/or back, the limit adjustment screw is on the left side of the operator (looking from the back of the operator and facing  the garage door).. If the lights are on the sides of the operator then the limit adjustment screw is on the left side (looking from the back of the operator and facing  the garage door).
Check the up and  down force: 

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

4 Answers

Garage door won't stay closed


Check the down limit:
 If the light bulb(s) on your operator are on the front and/or back, the limit adjustment screw is on the left side of the operator (looking from the back of the operator and facing  the garage door).. If the lights are on the sides of the operator then the limit adjustment screw is on the left side (looking from the back of the operator and facing  the garage door)

Jan 03, 2009 | Electrical Supplies

1 Answer

Garage door pad


You need to press and release the learn botton (don't hold it or you will clear all the codes)
If the light bulb(s) on your operator are on the front and/or back, the learn botton is on the back of the operator. If the lights are on the sides of the operator then the learn botton is on the right side (looking from the back of the operator and facing the garage door). 
After you press the learn button you have about 30 seconds to press in the new 4 digit code in your key pad then hold the enter button until the light on the operator blinks (about 2 seconds). If this does not work check the battery and try it again.

Aug 04, 2008 | Sears Craftsman LiftMaster Chamberlain...

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