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First thing I would do is remove the cover from the motor unit and check the drive gear. It is a white nylon gear just in front of the motor. It will be very obvious if it is going bad. The part number is 41A2817 and is available from Sears or any good door opener service company. It will come with instructions.
Using a step stool, reach up and remove the covers (the white covers pop off). The instructions will be labeled on the back plate for setting your remote control's security code Make sure the remote has a battery installed and is compatible with your garage door opener. Or go to the LiftMaster web site and down load its operators manual. .
Remove the cover and check the drive gear. It is white nylon and is just in front of the motor. Most likely stripped. The part number is 41A2817 and is available at any good door service company. It comes with instructions but you must be a DIY'er.
Sounds like you have the keypad that is hardwired.
To program the keypad, first unplug the garage door opener from the electrical outlet. Next, remove the nameplate from the console that the keypad plugs into and locate the program/operate switch. Flip the switch to program. Next, enter your desired four-digit PIN into the keypad. Slide the switch back to operate and plug the garage door opener back in. The keypad should be programmed.
These instructions may not work if the keypad is some other manufacturers.
so i spent the better part of this morning trying to figure this same thing out... here's what I found.
You need to identify the serial number, which is found on the unit hanging from the ceiling... it will be like a 13953970. I found mine behind the lamp light protector thing. NOT the back with the stickers. 41A5021 is actually not the number that is important.
then go to www.managemyhome.com its a website ran by sears. you have to register, for free. then go look for manuals, in one of the tabs running across the top of the site is a choice for manuals. then search by Craftsman then enter the serial number.
then pull up the owners manual and check out the instructions.
** i found out that the old house i bought did not actually have the same keypad opener as came with the craftsman. so i had to closely inspect all sides of the internal keypad opener (not the one outside) and find another serial number. then i went and got the manual from www.managemyhome.com and realized i needed to add a new 9-V battery before I could proceed. So now i'm heading out to walmart to get that.
after a frusterating morning of service number and internet searches I hope after I get this damned battery the clouds will part and god will shine some luck on me.