My similar back-story (feel free to skip to my answer below):
I have a Genie 3055, a wall button, a wall keypad outside, and a G3T Three-Button Remote for each of 2 cars.
This morning, one remote had trouble when I was leaving: the middle button (which I usually use) didn't work, and I needed to press a different button to get the garage door to close. (Yes, I'd programmed multiple buttons to open the same garage door just so that I could press any button and expect my door to open.)
Then when I returned home and tried to open the garage door, none of the remote buttons worked. I needed to get out of the car and use the keypad.
Even trying 3 new batteries (2 of which were from unopened Duracell and Energizer packages) and even trying the known-working battery from my other remote didn't work in this remote controller. So it seems like the remote itself was suddenly broken (which would be weird).
https://store.geniecompany.com/pages/genie-garage-door-opener-troubleshooting says:
"[If] Garage door opener works from the wall control, but NOT from the remote [then:]
- Check all remotes (if all the remotes and wireless devices stopped working at the same time, this could indicate the circuit board needs replaced)
- Replace the remote battery if necessary
- Reprogram the remote to the power head
- Replace the Genie remote if needed"
So I even tried re-pairing the remote (with its new battery installed) to the motor. But the remote's LED lights never turned on for any button press.
What worked for me:
https://youtu.be/u9dXZKoAz0I?t=111 said to try cleaning the metal contacts (where battery gets installed) with q-tips dipped in alcohol and gently try to bend them in to create a tighter fit. I doubted this would help because it already looked clean and tight.
But I bought some Equate 91% Isopropyl Alcohol and used it as instructed by that YouTube video, and immediately the remote started working again!
The instructions don’t say anything about programming the remotes “together” and frankly... I don’t want to do anything with the one that is working because if that one fails... I’ll never be able to open my garage door from my car! If you can think of something... anything else I could try... I’d be forever grateful :)
– user117446 May 20 '20 at 06:20