Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
If the main lights flash 10 times when the door reverses it is a door sensor problem. Make sure they are aligned and that the small light on each of them is lit and not flickering. If you can't get both lights to come on you most likely have a sensor that has failed.
If the main lights do not flash when the door reverses you most likely have a bad RPM sensor board. This is a small printed circuit board just in front of the motor and is what causes the door to reverse when it hits an obstacle.
You can also try increasing the down force adjustment which is on the rear of the motor unit near where all those white wires go. This will affect the safety reversing of the door so don't turn it too far.
Posted on Nov 13, 2009
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Posted on Jan 02, 2017
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Clear any obstruction from between the safety
sensors. Loose leaves, trash, and dirt on the lens of the sensor
itself are all examples of things that can obstruct the sensor's
Check each sensor for a steady
glowing indicator light. If both indicator lights are on, or if one
indicator light is flickering, the sensors may be slightly
misaligned. To check for misalignment; obstruct the beam of the
sensors so that they cannot see each other. When the beam is
blocked, the indicator light on one of the two sensors will
temporarily go out. This is the receiving sensor. Remove the
obstruction and loosen the wing nut on the back of the receiving
sensor. Adjust the receiving sensor until the green indicator light
goes out, if not already out, then realign until the green light is
bright and steady, then retighten the wing nut. This usually takes a
couple of attempts before it is back in alignment.
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