Hello, I have a three phase system with 2 parallel Multiplus per phase (6 units at all). I do not know why but I lost one unit (the master of phase 1). When I switch it on mostly no LED is flashing and the converter do nothing. The others work correctly. When I try to connect the sytem to the configurator I find the 5 other converters, but not the failing one. I tried to connect the unit directly to the MK3, then I could find it, but only for some minutes, then it disapears again. It seems there are SW problems on this unit. What further tests ca be done or how could I reset the unit without an interface?