Similar failure of a Neptune Powerbar EB6 with two outlets failed on (one being heat and the other ATO!) and all others off, regardless of "FALLBACK" programming. Fortunately the heater thermostat prevented a tank overheat and the ATO back up high level sump float switch prevented a flood. Both FMMs also failed. Currently running Apex 2016 off independent 12V PS without PowerBar attached for monitoring pH, Temp, Salinity, and have restored WAV power heads and DOS for 2 part dosing. Don't get me started on the unreliability of Neptune FMMs and the attached flowmeters, optical sensors and leak detectors...I programmed many control loops based on these sensors and have learned my lesson. Eager to follow your progression and attempt replicating with GHL on my next build. For now will strip down Apex to passive monitoring and no outlet control due to its toygrade reliability.