I see there's a few threads on cables with the Kemper remote.
I just bought a new 15m cable, heavy duty, much like the Kemper one and it doesn't work. Kemper remote display flashes on and off a few times and then goes off.
It does however work with a flimsy computer CAT5 cable but not with two other identical ones.
Seems really picky about cables......
Is this a fault or "normal"?