Hi, I would like to have a manual for a Liftmaster door opener , because I want to change the pin # I do not remember how to do It Please hel me out w/ this Thanks

Hi, The link below is a user manual for a liftmaster 3220, Page 32 is a Keyless ENTRY PIN (To add, remove or change a Keyless entry pin), I hope this helps.....CHEERS..
https://www.liftmaster.com/CatalogResourcesV3/en-us/shared/files/tucmanuals/114A3077.pdf

can you please provide the exact model number of your Security device...

Thanks

Follow these instructions to change the PIN. It will delete the existing one.

Locate the smart/learn button on the rear of the motor unit near where all those white wires go. Press and immediately release this and then walk over to the keypad and key in any 4 digit code you like and press enter.

Hi, it is probably the safety photo beams out of alignment or not working, when this happens the garage opener goes into 'dead man' operating mode, ie you need to keep the button pressed for the door to operate. You can find user and installation manuals here - Liftmaster Garage Door Opener Installation Manuals

I wish you had included the model number of this keypad but anyway go to this website. Click on manuals and enter your model. You can download the manual.

http://www.managemylife.com/

There's probably some kind of shear pin that has sheared off & will need replacing.

IF YOU ARE TALKING ABOUT THE ROLLER ON THE DOOR - THE TRACK IS TOO WIDE ALLOWING THE ROLLER TO COME OUT. USE THE CLAW END OF A HAMMER TAP THE TRACK MOUNTING BRACKET AT THE WALL TO MOVE THE TRACK IN CLOSER TO THE EDGE OF THE DOOR

ok... got it " LiftMaster Professional Model # 2575". Is this correct...?

Kindly wait & I will post back here again...

Regards,
micro

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.

Try this

http://www.bearcatco.com/PDF_OPENERS/Liftmaster/1200_Series.pdf