In reply to john arran:
> I presume you're using these in France where ring mains don't exist!
> We have a couple of them in permanent use here and it matters not which circuit they're on but it is crucial that they're on the same phase. So if you have a 3-phase supply that could be your problem.
Cheers. If I put both on the same circuit I still have the same problem.
The two devices are talking to eachother but it's coming up with an authentication issue.
E