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

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Garage opener only travels about 12"

Garage door opener moves about 12" to the closed position and then returns to the open direction 12". I disconnected the door - same problem. I removed cover and manually turned motor to the half open position. Same issue - door travels about 12" to the closed and then returns to the open direction 12". Same results with either wall switch or transmitter. Mdl 139.535
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If the main light flashes 10 times when the door reverses to the open position it is a door sensor problem. Check to make sure they are properly pointed at one another. If the main light doesn't flash then it is probably the RPM sensor board which is a small printed circuit board just in front of the motor. You might also increase the down force just a bit. This is an adjustment on the rear near where all those white wires go.

Posted on Oct 03, 2009

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Sounds like something is binding causing the safety feature to activate the same as if it hit something. Bring the motor down to the point where this happens and pull the plug. At this point turn the motor manually and attempt to find the obstruction. You can also confirm this by changing the sensitivity so as to almost cancel it. Don't leave it that way, the safety feature is to protect anything it might hit as well as the opener itself. Do this only for diagnostics only and be ready to kill the power.

Posted on Oct 02, 2009

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