I use a 202U v5 to switch an old garage door opener. It’s worked quite well for at least 2 years. It has suddenly stopped working. Here has been my troubleshooting.
New xmitter/fob battery…no change
Cleared the codes.
Pwr off…hold PRG1 & PRG2…Pwr on…SIG LED iluminates after 5 sec.
Attempted to store xmitter code.
Press & hold PRG1
Press desired xmitter button (xmitter/fob light flashes)
SIG LED does not flash.
Also tried to store code on PRG2, to no avail.