Pulling what's left of my hair out. I have been trying to add Zwave Plus devices to my network consisting of an ISY-994i v5.3.4 with a 500 series Zwave dongle, a serial PLM and a few dozen Insteon modules - and failing miserably. The ISY is in the basement. One plug-in module (module A) about 20' away in the basement works fine. Three modules in a first floor room above the ISY work fine (modules B,C are on-off switches, D is a fan speed control). Another module E about 20' away from B, C, and D through an intervening wall full of A/C ducts works okay (outlet). Any modules added beyond module E either work intermittently or not at all. My initial impression is that ZWave signals are super weak and not up to the task, in fact one could say the entire Zwave system is rigged to make you buy lots of modules to gain any sort of reliability. But I digress.
Modules A through D were included into the network at their install positions, apparently they are close enough to the ISY to it to register these units. The rest were included using a pigtail cable to power the device from an outlet adjacent to the ISY, after which the modules worked at that location. When they were moved to their installation locations about 15-25' from module E, they do not work. By my count they are three hops away from the ISY: ISY->B/C/D->E->F = three hops so that should not be the issue.
What's driving me nuts is a few days ago, before installing module E permanently, it worked fine on the pigtail at a location 25' beyond E's permanent location, let's call that location F. So I know RF is propagating to location F. But now, with module E installed, a module at location F does not work. ???
So my first question is, doesn't including modules adjacent to the ISY then moving them to another location mess up the mesh topology, and if so how is this corrected? "Update Neighbors" doesn't seem to to anything. "Heal network" is no longer supported in 5.3.4 so that's not it. If the network is self-healing how long does it take to sort itself out?