Hi this is my first post, I'm looking into the problem as described below.\nThe system went in about 7 years ago. All worked well,I’ve been told, until they moved a wall in an office and moved a single gang C-Bus light switch, a few months ago. From then on 4 groups of lights in that area go into a flashing fault, The groups flash independently of the other 3 groups , and not aways at the same time. This only occurs when the light group is dimmed.\n They were set at a min of 52%, I raised that to 65% but it just took a longer time from being dimmed to start flashing. It's not a constant flash the length of time between groups of flashing varies.\nTurning a group off and on, they come back on full, then dimming then restarts the length of time before they start flashing again. there is no effect on the other groups that are flashing when that is done.\nAll 4 groups come of a L5504D2A dimmer, the channel indicators don’t blink or flash.\nThey are having no problems any were else in the building.\nWe are not the first electricians to look at this. The last one’s replaced the dimmer ( that’s the L5504D2A, not sure what had been there before.)\nThe 4 circuits are driving Guild 13W led lights with Optoronic OTE 15/220-240/350 PC drivers. 2 circuits at 12 light, 1 at 18 lights and 1 at 25 lights.( currents are below ratings of dimmer). These have not been changed since install. ( so they did work ok)\nThere are 102 units on the system\n[LIST]\n[*]1 x 4 channel relay,\n[*] 2 x 8 channel relays,\n[*] 6 x 12 channel relays, \n[*]1 x 8 channel dimmer,\n[*] 2 x 4 channel dimmers, \n[*]15 x single switchs,\n[*] 3 x 4 gang switch,\n[*] 69 x motion sensors, \n[*]1 x PE cell,\n[*]1 x 4 channel aux relay, \n[*]1 x SC5000CTL2,WE touch screen.\n[/LIST]\nI’ve got a couple of questions, as I did my C-Bus course over 10 years ago and have used it about 5-6 times on small reprogramming /replacement of units.\n[LIST=1]\n[*]The number of units on the system 102 ? It had been working OK.\n[*]There could have been 4-6 more meters added into the circuit with the movement of the switch, would this have an effect?(total cable length)\n[*]Would 31LCDA ( load correction devices) make a difference if installed on the dimmer outputs? They had been working before. willing to try this.\n[*]I also noticed that not all pairs at the switches have been joined to daisy chain onward. (greens and browns)? Worked before.\n[*]I do have a L5504D2U Dimmer I could swoop in, but don’t think that’s the problem as the dimmer has been changed once with the problem the same as before.( the staff said the problem came back slightly worse the day after it was replaced)\n[/LIST]\nIf you are able to give some advise it would be much appreciated.