Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
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Posted on Jan 02, 2017
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!
Posted on Sep 23, 2008
Gears may be wearing out. Take of panel with light bul (4 screws) and look inside. See white stuff? That is your nylon gear that is worn out. Rebuild or replace,
Posted on Jan 15, 2009
The Coromaster 2000 does not operate off limit switches. It has a quarter-revolution optical pulse counter. To re-program the open and close limits do the following: Ensure that the door is open at least a couple of feet. Press the reset button once or twice Short out pushbutton and common and hold until close limit and then release. Door should stop at your new close limit. Wait 5 seconds. Short out pushbutton and common and door will open. Hold the short until open limit and then release. Limits should now be set.
Posted on Nov 09, 2010
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