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

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I have a Chamberlain Whisper Drive Security + model HD900D that is opening by itself awhile after the door has fully closed & I've gone into the house, sometimes its hours after the door fully closes. What causes this? Do I need to adjust the travel?

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If the door hits the floor too hard the safety will reverse it to the open position. This can be an intermittent situation. A bad wall control or the wiring to it will also cause this problem. To eliminate them you can remove the wire from terminal #1 on the rear of the motor unit. A staple in the wire can cut through the insulation.

Posted on Jan 03, 2011

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Posted on Jan 02, 2017

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