I am having issues with my 220V charger (the 50A wired one, not the 70A wall-mounted one). When I connect it up (wall, then car - not that it matters, I get the same problem either way) the car goes from white, to blue, to red. The light on the charging cable goes from solid green to 3 flashes of green, then one red (continuously). I contacted Tesla yesterday and they downloaded my logs and are reviewing them.
We have two-phase power coming into our house panel (2 x 110V and a neutral - no separate ground.) There are four wires going to the NEMA 14-50 (2 hots, ground, and a neutral.) I traced them back to the panel and both the ground and the neutral go to the ground bar (like all of the other wires coming in.) I checked the voltage at the receptical, and there is 120V to ground, 120V to neutral and 240V between the hots (exactly what I expected.)
When I called Tesla, they told me the charger is very sensitive to voltage differences and fluctuations. I am wondering if the charger needs the ground and neutral to be completely separate? If so, I am screwed because there is no way I am running a separate ground to the panel and separating all of my neutral and ground wires.
Does anyone else have a similar wiring setup (ground and neutral are shared?) I am told this is common in Florida (at least it was in 1985!)