I have model 139.53671 SRT gagrage door opener

If there isn't a SRT or Learn button, the garage door opener may only have dip switches to link the remote to the opener. In that case, your keypad won't work.

I wish that I had better news for you. Please add a comment with the model number of the opener for further assistance. It's possible that you have a model with the controls that aren't on the back of the opener. I can try to find more information on the unit with the model number.

Cindy Wells

TC . links to trouble shoot remote and replacements.
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How to Program Craftsman Garage Door Opener Remote

https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjK6ru8s_rKAhUimoMKHasTAtYQtwIIGzAA&url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DIU80hOcnNQo&usg=AFQjCNFXh3W7zMAccKCNvoFsR-AsU5cm6w

craftsman garage door opener remote not working

How to Fix Garage Door Opener Remote That Has Stopped Working
Troubleshooting Garage Door Opener Remote Problems Sears PartsDirect

What is it you want to do? You cannot just change the code without purchasing new remotes and not using your old remotes.

A good way to program is to hold the button down on the remote and then press and release the smart/learn button.

Model number 53753.

Hold the button down on your remote and then press and immediately release the smart/learn button. Do this for each remote.

Press and immediately release the smart/learn button and then walk over to your keypad and key in your 4 digit code and press enter.

The key to this is to immediately release the smart/learn button. If you hold it in you will erase what you just did. If you still have a problem please post back.

A replacement remote for your unit runs around $40.00 and the manual is $5.00. The remote is part number 53753 and the manual is 114A3129. FYI the manual will not have instructions for programming your car. The cars owners manual should have those instructions. The frequency of your opener is 315mhz and if your car is older than 2005 it most likely will not work at all.

Press and immediately release the SRT button and then walk over to your keypad and key in any 4 digit code you like and press enter.

I think this is an easier way to program. Press and hold the button on the remote and then press and immediately release the smart/learn button on the rear of the motor unit. Do this for each remote you have.

The button you added in your car is an earlier technology that is not compatible with the rolling code technology.