Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
The sensor colors are normal. If the main light is flashing 10 times when the door reverses it is a sensor problem. Make sure the small light on each one is not flickering ever so slightly. Tweak them a bit to make sure. If the door is reversing when it hits the floor you need to adjust the 'down limit' control on the side of the motor unit. Turn the control in the opposite direction of the arrow printed on the cover. You might also increase the 'down force' control which is on the rear of the motor unit.
Posted on Dec 12, 2009
First, I made sure there were no obstructions to the sensors. Then, I adjusted the "down limit" switch towards the minus side a little bit and this solved the problem.
Posted on Feb 06, 2010
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Posted on Jan 02, 2017
Most likely your door sensors have been bumped and are not aligned properly. Make sure they are pointed at one another and the small light on each one is lit and not blinking.
Posted on Apr 30, 2009
They are doing what they are designed to do. To work properly they must be pointed at one another and to tell when they are aligned the light on the receiving unit turns on.
Posted on Jun 08, 2009
Anytime the main light flashes 10 times and the door reverses to the open position it is a door sensor problem or the wiring to them. Nothing else causes this symptom.
Posted on Sep 14, 2009
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