I've been reading lots of complaints about the CM15A being erratic, and most of the stories related to installations that are significantly more sophisticated than mine. I am only using lamp modules of various flavors, wall switch modules for outside lights, and controlled receptacles for my landscaping. I have only 2 macros: 1 which runs at dusk (turn on some inside lights, wait a 1/2 hour, and turn on outside lights); and 1 which simply turns everything back off at dawn.
I use very little RF(only an X10 remote), and do that with the 751 because the RF on the CM15A is useless. I also have totally given up on asking the CM15A to do anything more to a lamp than just turn it on or off... attempting to set lamps to less than 100% brightness simply doesn't work and never has. I've read and tried all sorts of suggestions on how to set up your macros to make dimming work, and most of the time it has simply caused more problems.
The unpredictable and most aggravating part is that this module will, for no apparent reason, simply forget to execute a part of a macro every now and then. It is NOT a signal issue, because I have one-way switch and lamp modules which I assign the same address to. When the issue occurs, all devices with that code do not come on. My Signalinc repeater is working fine also. I have outside lights, for instance, which are on the same address and on different phases. Either they all come on, or none of them. Sometimes it will forget to turn on the outside lights, sometimes the landscaping lights, sometimes a group of curio cabinet lights. The next day everything will work fine without any intervention. I sometimes do an erase and reload on the module if it happens more than once in a week, and it will work fine for a while, and then act up again at some point. Use of the rf remote to turn these devices on, immediately after the CM15A forgets them, works without issue every time.
My CM15A is out of warranty, of course, having been purchased in Dec of 2005. I would consider ordering a replacement unit, but the horror stories I've been reading in this forum make me wonder if I should just leave well enough alone.
Anyone have any words of wisdom out there on what I should do? Not quite ready to jump to Insteon, but this really does get aggravating at time.