So the keypad in my garage is playing up.
I got my tenants to change the PIN number which seems to have fixed the problem. To me this sounds like an issue with one of keys being broken.
Ever play the game mastermind? Similar issue.
So fixing the problem. We can get another remote. Looks like a generic version of the remote exists:
This is a video to program them with:
We can also buy a new control pad.