ENaiman

@stusviews That was completely uncalled for. I am not an electrician and expecting me to open all these boxes and trying to figure what is in there is not a 5 minutes task. Besides if I told you something like "There are 7 wires in there, 4 reds and 3 brown; one red going to a terminal, 3 reds going to another and 3 browns to another" that would have given you the perfect picture, right ... I can bet all my money that your next question would have been to describe the switch then a lot of other related questions. It was simply not worth it. I have asked for help from somebody who "had experience" in this, somebody who did it before. All I needed was a wiring diagram (which should work everytime in a 3 way circuit) and brianp6621 was very kind to post one. My reply thanking you for your help should have been an indication that I do not wish to follow your idea. @brianp6621 Thank you, you are absolutely right and I didn't see that. I am sure I can sort this out now.

It's just too complicated to open all the boxes and to try to figure out what goes where. Thanks for your help

Cool, now let's see about your down-under travel arrangements

@MFBra All that checks out except I'm not sure it is the "last" switch - might as well be the first. I'll speak to my electrician. Thanks,

That is exactly how I done mine (if you remove that "switch" connected to Sense 1 - where is that coming from anyway?) and I did checked to see if there was a change on Sense 1 when any switch was flipped. There was definitely a change but still the mico module didn't react.

@MFBra Thank you very much - that's an excellent starting point. I realised it is exactly my setup - the micro module works and it turns lights on/off but for me, those light switches aren't working at all.

Thank you guys for all your help; I will try to answer your questions to my best. @stusviews I live in Australia so we have different wire colours here; I'm afraid that won't help at all. @brianp6621 If I get the module between the load and the last switch then if the module is in the "off" position, I won't be able to turn on the lights using the light switches so that won't work. It seems the solution is indeed to have 2 modules - I don't have yet clear the connection diagram unfortunately.

Is anyone here by any chance having some experience in using the Insteon micro module to control a 3 way switched light? I have now several days of trying different setups and nothing works as intended. What happens? - the micro module turns on/off the lights every time when its micro switches are pressed or when it is controlled from ISY - when the light switches are pressed (any of them) the lights are turning on/off erratically (sometimes it works but mostly not) What I have done? - I have my module installed behind one light switch (not behind the middle one) and configured as "latching" - I toggled on/off the "3 way toggle mode" (which is active by default) several times and tested to see if it made any difference ... it didn't - monitored the sense wire used - whenever any light switch is used, the power is applied OR removed to/from the sense wire - used 3 different modules - same behaviour I simple don't know why it is not working. Any help is appreciated.

I do apologize if I am asking a dumb question but I would like to know what is exactly the significance of these "3 hops" I know that every device between the ISY and the target device equals 1 hop and my question is - what happens when I need to have a device which would be 3 or more hops away? My house has quite a big surface spread on 3 levels and since I can't place the ISY dead in the center of everything, I will have situations where some devices will be quite distant. What will happen then? - can I enroll a device which is more then 3 hops away? - supposing I can have the device closer just to enroll it then move it away at it's designated place - will it work then? I live in Australia and basically I have no PLM to work here (I am using a modified hub) and some other Insteon devices are not available (the only way to expand my network is by using these plug-in modules) . How can I get the system to work? Is it possible to have something like 2 ISY's working together? What can I do? Thank you for your help,