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UMC Working - Not Working - Working again

Discussion in 'Model S' started by shawnbush12, Jun 14, 2013.

  1. shawnbush12

    shawnbush12 Member

    Joined:
    May 20, 2013
    Messages:
    11
    Location:
    orlando
    Here is the data:

    Charged fine on the GE charger at work. Came home:


    1. 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.
    2. Screen on car's screen cycles through 0-230V up and down and Ring turns Red.
    3. LED on charger blinks GREEN and unit clicks 4 times with each Green but does not go Red.
    4. 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:

    1. Tried 230V plug with same results but now charger blinks 2 times RED. Cycled power, unplug replug, hit reset. Same results.
    2. Tried on 120V/20 Amp plug. Car has been dialed down to 11A so breaker will not trip since delivery. Same results as above.
    3. Press reset on charger and car begins to charge at 11A.
    4. Removed plug from car.
    5. Plugged charger into 230V and plugged into car – car charges at 30 Amp.
    6. 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.
     
  2. tdelta1000

    tdelta1000 Active Member

    Joined:
    Jul 19, 2009
    Messages:
    1,667
    Location:
    South Florida
    Keep us posted on the developments.
     
  3. mknox

    mknox Well-Known Member

    Joined:
    Aug 7, 2012
    Messages:
    8,568
    Location:
    Toronto, ON
    I cross my fingers every time I plug in. See this post (and the entire thread) for details. It got to the point where the UMC button wouldn't even open the charge port door. Since software 4.5 it's been much better, but the other day at the Yorkdale store, their HPWC button would not open my port and I had to use the touchscreen.
     
  4. FredTMC

    FredTMC Model S VIN #4925

    Joined:
    Dec 26, 2012
    Messages:
    3,015
    Location:
    Orange County CA
    I had a bad one. Just take it in to center and have them switch it out. I did.
     
  5. shawnbush12

    shawnbush12 Member

    Joined:
    May 20, 2013
    Messages:
    11
    Location:
    orlando
    Both the UMC and the GE charger worked at my office. I called Tesla and their troubleshooting reported a bad charger in the car. There are two chargers, a master and a slave, the master was reporting an error and they believe the slave now is taking over and that is why I can charge on the chargers I am using. If I was using a 100 amp charger I would only be able to charge at 1/2 the amps since one charger is faulting out. they are sending someone to my house to replace the charger in the car.
     
  6. ZBB

    ZBB Emperor

    Joined:
    Feb 27, 2013
    Messages:
    1,419
    Location:
    Scottsdale
    My car is currently in the shop having the master charger replaced (I didn't get the optional second charger, which would be the slave...). I went to go to work yesterday and found that the car did not charge overnight on Wed, which was day 8 with the car. I had enough range to get it in to service, and they diagnosed the issue shortly thereafter, but didn't get the work done yesterday. I should get it back this afternoon...
     

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