Here is the data: Charged fine on the GE charger at work. Came home: Plug into 230 V/40A plug. Car has been dialed down to 30 amp since delivery. Ring turns green, Charger blinks running green. Screen in car shows 230V/30A with 0A charging. Screen on car's screen cycles through 0-230V up and down and Ring turns Red. LED on charger blinks GREEN and unit clicks 4 times with each Green but does not go Red. Unplugged charger and retried, cycled breakers and retried, pressed reset on charger and retired. Called Tesla and they did a remote troubleshoot and think the UMC is bad. The next morning: Tried 230V plug with same results but now charger blinks 2 times RED. Cycled power, unplug replug, hit reset. Same results. Tried on 120V/20 Amp plug. Car has been dialed down to 11A so breaker will not trip since delivery. Same results as above. Press reset on charger and car begins to charge at 11A. Removed plug from car. Plugged charger into 230V and plugged into car – car charges at 30 Amp. Unplugged at car and replug – car charges at 30 Amp again. I will try the GE Charger at work later today and bring my UMC and try it in the plug I had put in by the GE Charger.