On the rear of the motor unit near where all those white wires go you will find the smart/learn button. Press and immediately release this and then key in the 4 digit PIN of your choice and press enter. This should take care of the keypad. You can try programming for the remote. While holding the button down on your remote press and immediately release the smart/learn button. If this doesn't work the remote is bad and needs to be replaced. Make sure the replacement matches the model number of the opener.

Hi Gail - My 139.18874 opener has the same remote. I found a manual on-line (aaaremotes.com) for a liftmaster 1300 that is virtually identical, and am using it to install my second-hand opener. Everything is bang-on so far, and I'm ready to programm the remote. Waiting for batteries to complete the setup. Sears will provide manuals, quoted me $17 Cdn with 3 weeks delivery.

Here are some items to check. Limited range of your remote controls could be related to radio frequency interference that comes from something in your home or in the surrounding environment. Certain electrical devices can radiate interference; this could be almost anything that is plugged into an electrical outlet. Please keep in mind that the device can be brand new, or can be an item that has been in use for quite a while. Also, the item may continue to function properly as far as you are able to tell. The only problem with the item may be that it has started to broadcast the interference, with no other symptoms noted. Some devices are more likely to generate interference than others. This includes TV cable, cable amplifiers, surge protectors, fluorescent lights, battery charging devices (power tools, golf carts, etc.), anything that utilizes a timer (sprinkler systems, lights, alarm systems, etc.), and a myriad of others. If the problem seems sporadic, we can safely assume that the device responsible for the interference is only being operated during these times. Again, please keep in mind that the age of the device does not determine if it is capable of broadcasting unwanted interference. Any electrical device can be the source of the problem. The first step is replacing the battery in your remote. If the range on your remote does not improve, remove the wall control wires from the overhead unit. If the range does not improve you will likely need to replace the remote control. After replacing the remote, or if you have other remotes programmed in to the opener, and the range problem still exists, please proceed to the Power Down test. Multiple garage doors: If you have two garage door units and one is working just fine, you will need to start by unplugging the good unit. This will help determine if the unit with no range starts to function properly. If the range comes back to the bad unit then you will need to replace the logic board on the unit that was unplugged as it is emitting an RF signal that is over powering the other garage door opener. If the range doesn not improve after the "good" unit has been unplugged, replace the batteries and try programming some additional remotes to determine if the existing remotes are the issue. If the extra remotes do not have any range then you would need to replace the receiver logic board in the "bad" unit. Power Down test: To isolate potential sources of interference, turn the circuit breaker off to the garage and plug the garage door opener into an extension cord from another room. If the range improves, then the interference is coming from a device in the garage. If no improvement is seen follow the same procedure, this time turning off the circuit breakers to your home, with the exception of the garage and test the remote controls. If improvement is noted, turn the circuit breakers back on, one by one, until the range problem resurfaces. This will allow you to narrow down what room the problem device is in. You will have to go from there to isolate it further, by unplugging and re-plugging the items in that room. If you are unable to determine any source of interference, then the receiver logic board in the overhead unit will need to be replaced.

I ran the bell wire from the motor to the sensors and to the wall mount control. Did not see any breaks. Removed the sensors and examined, then placed back and aligned the beams. Everything works (wall mount control, hand helds)the beams when broken stop the door. Everything except the outside wireless entry pad and the sensor switch when you walk through the open door that turns on the light. I think now it must be something in the logic board. Perhaps lightening zapped it and knocked out the above. For now now I will live with everything else that works. Once something else goes haywire, then I figure it will be time to replace the logic board or the whole unit. Thanks for the help.