I have almost finished a fairly large residential installation that has gone fairly smooth except for one rogue Universal dimmer. The unit in question has 4x12w LED DL's on channels 1 & 3, 2x12w LED DL's on channel 2 and a LED wall light (with remote driver) on channel 4. The lights come from a high end lighting company who maintain that their lights are c-bus compatible with Universal dimmers. The issue is that all three banks of dl's flicker to varying degrees with one of the banks of 4 (C3) actually switching off completely after a few seconds. The wall light works ok whilst on but flickers when switched off. I should mention that there are 4 other dimmers on the job with the same dl's with [I]almost [/I]no problem ( i did notice one set of lights flicker a couple of times shortly after powering on but seems to have stopped). After trying a few things i eventually took down one of the dl's on C3 and plugged in a iron core tranny that i had in the van. Doing this not only fixed ALL problems including flickering/flashing on other channels but enabled the dl's to dim right down to zero. I would say that i have found a fix but i noticed that on the dimmer unit the indicator for C3 was at first flashing orange/green indicating a short and that the indicator for channel 4-the wall light-was red which according to the help file in toolkit means "other card"-whatever that means but the wall light works perfectly. After powering down all devices and restarting, the flashing orange/green changed to flashing orange but the red light remains. A system test was all good with no faults reported. Does anyone have suggestions as to what the problems might be?