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

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I have a 1/2 HP Craftsman garage door opener. I don't have the manual anymore. The date for it is 8/99. Numbers on it were 41A4315-7D and 132C2105-1. It goes up fine. It will go down a little bit and then it will reverse. It won't go down all the way unless I get out of the car and go push and hold the button. How do I fix this? Thanks.

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If when the door reverses to the open position the main light flashes 10 times it is a door sensor problem Make sure they are pointed at one another and that the small light on each one is lit and not flickering. Tweak them a bit. If the main light doesn't flash 10 times when the door reverses it could need a little more "down force" or a bad RPM sensor board which is a small printed circuit board just in front of the motor. The "down force" control is on the rear of the motor unit.

Posted on Sep 02, 2010

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Hello,

I had the same frustrating dilemma with my Craftsman LiftMaster garage door and Keypad, Model 139.53754-01 (dated 10/06; and has the # 315 MHz).

To resolve “the dilemma”, grab your keypad, climb up on a ladder to access the garage door opener’s motor unit. On the right side of the motor unit, remove the white plastic casing by pressing buttons on each side and pulling down. This will expose the programming area, and for our purposes, the “Learn” button.

1. On the motor unit, press and release the “Learn” button. The Learn indicator light will glow steadily for 30 seconds.

2. Within 30 seconds, enter a four digit personal identification number (PIN) of your choice on the keypad. Then press and hold the ENTER button.

3. Release the ENTER button when the motor unit lights blink. The code has been “learned”/stored/activated.

Good Luck, and I Hope this Helps!
Gail
For possible future reference:

How to change an existing, known PIN
(Changing an existing PIN can be done with the wireless remote keypad, and does not require access of the motor unit.)

From the keypad:

1. Enter the four digits of the present PIN, then press and hold the # button. The opener light will blink twice. Release the # button.

2. Enter your new 4-digit PIN and press Enter. The motor unit lights will blink once when the PIN has been “learned”/stored/activated. Test by entering the new PIN, and pressing Enter.

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