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We have a LIFTMASTER chamberlain garage door opener and it will just goes down so far and then it goes back up and the lights flash on and off. Then the next time it will work just right.

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Posted on Jan 02, 2017

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SOURCE: Sears Craftsman Garage Door Opener Wireless Keypad Model and a LiftMaster Chamberlain Professional Garage Door

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.

Posted on Jun 24, 2008

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SOURCE: Chamberlain Liftmaster Professional 1/2 HP

Okay...upon further inspection, my left spring has broken in two. Going to call around for some quotes to replace the spring. Thanks for the suggestions.

Posted on Jul 25, 2008

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SOURCE: chamberlain master reset

There isn't a reset.

Posted on May 07, 2009

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SOURCE: Code reset button for garage door opener

The button is just to the left of where all those white wires go. You may have to remove a light lens to get to it.

Posted on Jun 08, 2009

  • 1 Answer

SOURCE: I have Chamberlain LiftMaster 1255R garage door

My garagedoor opener is not working.
I open the box and found the plastic gear worn out.
I have Liftmaster 1255R.
Do I need to replace the whole box or replace the worn gears?

Posted on Feb 09, 2010

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If the main light flashes 10 times when the door reverses it is a door sensor problem. If the door is hitting the floor and reversing with no flashing of the lights it is caused by the door traveling too far. On the side of the motor unit you will find the 'down limit' control. Turn this a bit in the opposite direction of the arrow printed on the cover. Some tweaking of this control will probably be needed to get it just right.

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Garage door goes down a foot and goes back up. light by learn button flashes five times


That light is sending the code for RPM sensor or motor overload. Most likely it is the RPM sensor which is a small circuit board just in front of the motor. The part number is 41C4398A and is available at any good door opener service company.

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I have a chamberlain liftmaster professional Formula 1 Garage door opener that has been working for 5 years. Now will not go down unless you hold the main button. Sensors blink when it hits within 3...


Anytime the main light flashes 10 times and the door reverses to the open position it is a door sensor problem. They each have a small light that should be lit, both should be the same brightness and not flickering ever so slightly. If not tweak them a bit. If both lights will not come on you have bad sensors.

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My Sears Craftsman K1026 05/94 139.53779 HBW0709 appears to be locked. my garage door goes down and immediately comes back up


If the main light flashes 10 times when the door reverses it is a problem with the door sensors. Make sure they are pointed at one another and the small light on each one is lit and not flickering. If you cannot get both lights to come on you have bad sensors.

If the door hits the floor and reverses to the open position but the main light does not flash it is because the door is traveling too far. Locate the 'down limit' control on the side of the motor unit and turn it in the opposite direction of the arrow printed on the cover. Some tweaking may be necessary.

Jul 27, 2010 | Sears Craftsman LiftMaster Chamberlain...

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Door goes down then right back up again


If the main light flashes 10 times when the door reverses you door sensors may have been bumped and are no longer pointing at one another.

If the door hits the floor and then reverses it is traveling too far. Locate the down limit control on the side of the motor unit and turn it in the opposite direction of the arrow printed on the cover. Some tweaking will be necessary.

May 22, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I cannot get the door to stay closed it cycles down the goes right back up after it reaches the floor


If the door reverses to the open position but the main light on the motor unit does not flash it is because the door is traveling too far. On the side of the motor unit you will find the 'down limit' control. Turn this just a tad in the opposite direction of the arrow printed on the cover. Some tweaking may be necessary.

Jan 27, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Garage door goes down 3/4 way down then goes back up and flashes 10 times


Your door sensors have probably been bumped and are misaligned. They must be pointing at one another to work properly. Each of them has a small light that should be lit. If you cannot get both lights on the sensor to come on you probably have a sensor that has quit working.

Oct 28, 2009 | Sears Craftsman LiftMaster Chamberlain...

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3.75 craftman garage door goes down a foot then immediately reverses back up


If when it does this your main light flashes 10 times it is the door sensors. Make sure they are aligned properly. If the main light doesn't flash 10 times then you most likely have a bad RPM sensor board. It is a small printed circuit board just in front of the motor.

Jun 28, 2009 | Sears Craftsman LiftMaster Chamberlain...

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