elk m1 stopped communicating with some of my upb light switches

[joe39562]

Can anyone tell me why my m1 stopped being able to control a select few of my pub lights?  To be fair it appears that these select few light switches won't respond to links on other switches so this may not be an m1 issues.  Any help is much appreciated though!

 

[RAL]

The first thing to ask yourself is "has anything changed recently?"  Did you add some new electronic equipment, or even old equipment that wasn't previously plugged in?  Did you install some new LED light bulbs?  Start going around and disconnecting things, or flipping circuit breakers and see if the problem goes away.  That will help you narrow down what might be causing the problem.

 

[joe39562]

To my knowledge  nothing has changed.  I did notice while using ek pro to activate and deactivate the lights that they do make noise as if they are communicating but just doesn't turn on or off.

 

[mikefamig]

The buzzing sound leads me to believe that the switch has received a link and is responding to it. I would remove one of the switches and put a volt meter on the load side when you hear the buzzing as it receives the link.
 
Mike.

 

[pete_c]

The above and you can just connect a UPB serial PIM to a laptop  / Upstart and do a granular look see at your switches and any signal levels, noise et al that might be on the powerline.  Walk around the house and test too with the PIM plugged in to an outlet adjacent/same circuit to your current Elk UPB PIM.
 
Here keep extra PIMs on line and serially connected to a terminal server just for diagnostics.
 
Upstart is a very nice diagnostic program which will run on whatever flavor of Windows you can run on a laptop.  For the serial connection utilize a USB to Serial device.
 
Here many years ago had a UPB signal drop but no noise.