[Hai-users] Phantom on/off problem

[Dave Horoschak]

I'm having a problem with X10 switches turning on by themselves.  I have 
a system that's worked well for about 2 years and now this problem has 
appeared.  I'm 99% sure that it's related to a recent HVAC install. 
I've tried changing unit & house codes but it doesn't seem to help the 
problem.  When I get home, any combination of the 3 affected lights may 
be on.  I've only seen this problem on 3 of my approx. 25 X10 switches 
installed.  These lights can turn on by themselves while I'm home as well.

I'm running all Leviton switches connected to an OP2 though a CM11A.  I 
have a coupler/repeater installed as well.

Two questions:

1. Is there anything else I can try to solve the problem with my 
existing equipment.

2. Would changing to a different PLC system likely help the situation? 
If so, is UPB the current recommended choice?

Thanks!
  - Dave