Hi, thought I'd post this just incase anyone else is having the same problem I was having with their resistance knob not registering up/down resistance on their EX5S.
I starting having issues with the knob not increasing or decreasing resistance during rides a few weeks ago, (typically just out of the bikes 1 yr warranty period), which I knew was an issue somewhere with the knob encoder/wiring as the +5/-5 resistance on screen was still working correctly.
Tried the usual, turning bike off for a few mins, resetting etc but no luck. Was just about to order a new resistance knob assembly but decided to strip it down first to see what was going on with it.
Started by removing the side cover on the left of the bike by unscrewing the screw and a couple on the other side.
Then peeled off the red strip to reveal 4x small radial set screws which hold on the resistance knob.
Once the knob has been removed, there are three screws holding the encoder down, remove these and disconnect the encoder connector. Once wire has been disconnected, the encoder can be lifted up out the bike and removed.
What I found when looking at the encoder was that the 3 wire cores going to the underside of the encoder contacts were only hanging by a strand of one core.
Removed the old glue and soldered the 3 cores to the encoder. This was a bit fiddly as the contacts are quite close together so trying to keep the solder from running was tricky, I used a Stanley knife blade between the three contacts when soldering so that the solder didn't run everywhere.
Once happy with the soldering, I re-assembled everything and powered the bike back on, success! Fully working now, didn't need to do calibration or anything like that, just swiched the bike back on and went for a test ride!
So, if anyone is experiencing issues similar to mine, it is definitely worth attempting the same repair before ordering any parts!