The crossfader could be dirty, defective or just not connected properly. Remove the top screws, unplug and remove it, blow it out with compressed air or try some switch cleaner. Reconnect and see if it helps.
This is more likely to be an issue with the fader itself rather than the controller.
Then it’s probably defective. I keep the device very clean and free of dirt. When I’m not using it, it’s in a flight case with a decksaver on top. A bad connection seems unlikely because I’ve never removed the crossfader and can hardly imagine it coming loose. So I’d best look for a different crossfader, or perhaps try using a contact cleaner first.
I checked the connectors, they look good, I used a cleaner, should be clean, tested it, stil nothing, then I used the tip of my screwdriver to short the connectors, and I could switch between L and R, so a defected fader?
Thanks for the tip mufasa, but the innofader is to much for my needs, I replaced the fader with a new same one, and everything is working again, if this last also a decade then that’s more than enough for me, this fader cost 1/10 of the innofader cost.
After decades of seeing how different people treat their gear in very different ways, it’s become obvious that the average time between failures is very much down to how the gear is treated.
I’ve seen some DJs hit play using a full arm action akin to them pulling a Golden Eagle from the skys, with speed, force and momentum that would surpass NASCAR statistics … and then they wonder why their controls fail. In such cases, it’s not the control that failed, imho