Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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My remotes for my 1/2 hp craftsman and I have adjusted the sensors on both sides to make sure nothing is blocking them what can I do to get the remote to work?

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Check the battery.

Posted on May 18, 2011

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Make sure the brackets for the sensors are tight and the small light on the sensors is not blinking ever so slightly. You also might try shading the sensor so that the sun is not shining directly into the lens.

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The sensors only work when the door is closing. Remove the cover from the motor unit and check the drive gear. It is a white nylon gear and is probably stripped.

May 16, 2010 | Sears Craftsman LiftMaster Chamberlain...

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Chamberlain 1/2 HP garage opener main part 41A5389-1 will not close door. Motor stops about 1 ft into travel on screw. Nothing blocking door - can easily open and close door manually. What to do?


If the main light flashes 10 times you have a door sensor problem. Make sure the small light on each sensor is on and not flashing. Tweak them if necessary. If the main light does not flash then you can try increasing the down force just a bit. This is a control on the side of the motor unit where the small gray antenna hangs. If this doesn't work you probably have a bad IR sensor which is a small printed circuit board just in front of the motor.

May 11, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a sears Craftsman 1/2 HP garage door that was working fine,all of a sudden when I close the door,using the wireless remote, the door goes down to about 12 inches off the ground then pops back up as...


If when the door reverses the main light flashes 10 times it is a door sensor problem. Make sure the small light on each one is lit and not flickering. Tweak them a bit. If you can't get both lights to come on you have either bad wiring to the sensor or the sensors are bad.

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1 Answer

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If the door is hitting the floor and then reversing you need to adjust the 'down limit' which is on the side of the motor unit. Turn it a bit in the opposite direction of the arrow printed on the cover. Some tweaking may be necessary.

Oct 08, 2009 | Sears Craftsman LiftMaster Chamberlain...

2 Answers

Craftsman 1/2 HP door opener bounces back open


Hello,

There should be 2 sensors on the bottom of your door on the inside, 1 on the right side and 1 on the left side.
These sensors serve 1 purpose to send a beam or reflection to each other.
If something is blocking this reflection or is in front of the sensor the door will always come back up.
It is a safety feature so nothing or no one gets hurt when the door is closing!

Sep 22, 2008 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Old nutone garage door opener


Hello,

There should be 2 sensors on the bottom of your door on the inside, 1 on the right side and 1 on the left side.
These sensors serve 1 purpose to send a beam or reflection to each other.
If something is blocking this reflection or is in front of the sensor the door will always come back up.
It is a safety feature so nothing or no one gets hurt when the door is closing!

If any thing is blocking these sensors the door will not close! Make sure nothing is in the way not even a peice of paper.

Sep 19, 2008 | Sears Craftsman LiftMaster Chamberlain...

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