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[DKDEAN]

I have two simple light timers, for old wall switches - WS467 (not SoftStart).  The lights generally turn on OK using a timer but usually don't turn off.  The challenge is that it's not consistent.  I'm using AHP v3.306 and my hardware, including computer, printer, etc. haven't changed for the last couple years. 
I understand that line noise can cause problems, but how do I identify it when the behavior is not consistent?

I've used X-10 AHP at a basic level since this house was built 14 years ago.  The old transceiver connected via serial port and worked like a champ for the last 13 years.  I added a phase coupler early on to handle phase issues.  Since then, I hardly ever touched it except to change the batteries.  When that computer died and I was forced to use the new USB transceiver, my simple timers no longer work consistently.  (I'd love to go back to the serial transciever but I understand it's not supported, correct?)

Does it make any difference if the transceiver is plugged in to different circuits in the house?  It would make sense that different electrical circuits would have more/less noise but it doesn't seem to make any difference on my tests.  I'd appreciate any suggestions.  Please don't tell me a) it's noise, b) set timers to repeat, c) it's soft start.  I understand that much.  How can I troubleshoot this more effectively?   (I'm happy to post my simple AHP file if you'd like to see it.)

[dave w]

Please don't tell me a) it's noise, b) set timers to repeat, c) it's soft start.  I understand that much.  How can I troubleshoot this more effectively?  

Like it or not, I'm going to tell you it is probably noise, assuming your coupler is working (get a repeater, a coupler only attenuates the signal which is NOT what you want to do when "everything" is now using switching power supplies).

When the lights do not turn off by the timers, can you turn them off from AHP screen? If not,  look for noise source.   If so, it may be a AHP problem. Download the latest version and verify your switches are identified as non soft start.

If you can't turn the lights off from AHP, consider a degrading coupler or noise. If the problem lights are on the opposite phase as the CM15A I would get a repeater.
If noise is suspect and the problem is inconsistent then determine what noise sources are on when the lights do not work. Look for CFL bulbs, and switching power supplies that are operating. Concentrate on the same circuits that the lights and CM15A are connected to. Anybody just plug their cell phone to the charger? Turn on the flat screen? Plug in their laptop? Dishwasher, or high efficiency washing machine start up? Any new appliance, HVAC, radio, etc?

[Brian H]

http://jvde.us/x10_troubleshooting.htm
http://www.act-remote.com/PCC/uncle.htm
http://kbase.x10.com/wiki/Troubleshooting_X10_Home_Automation