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Scheduled Charging Failed

fluxemag

Member
Jan 10, 2013
477
188
Portland, OR
I picked up my Model 3 two days ago, and set it up to use scheduled charging to begin at 12AM on a 14-50. The first night I can confirm it started at midnight and was fully charged by morning. But this morning I came out of the house to go to work at 7:30AM and it had just started to charge when I approached the car. I looked at my camera footage and the UMC started to charge at 12AM but then stopped 5s later and had a single light blinking (can't tell what color). My guess is the UMC sensed a voltage drop or something, which is odd considering my Model S charged on it with no issues for two years. And why would it start charging when it unlocked in the morning?
 

FlyF4

Son of a MX
Mar 21, 2017
842
664
moved to San Diego
I picked up my Model 3 two days ago, and set it up to use scheduled charging to begin at 12AM on a 14-50. The first night I can confirm it started at midnight and was fully charged by morning. But this morning I came out of the house to go to work at 7:30AM and it had just started to charge when I approached the car. I looked at my camera footage and the UMC started to charge at 12AM but then stopped 5s later and had a single light blinking (can't tell what color). My guess is the UMC sensed a voltage drop or something, which is odd considering my Model S charged on it with no issues for two years. And why would it start charging when it unlocked in the morning?
Puzzling. I'd like to hear the theories on this one too.
 

fluxemag

Member
Jan 10, 2013
477
188
Portland, OR
It happened again last night, car didn’t charge. I checked the app first thing in the morning and the car immediately started charging, with solid 240V 32A. I’ll notify service.
 

fluxemag

Member
Jan 10, 2013
477
188
Portland, OR
On Friday, I was checking out the folding rear seats, and slammed the driver's side back into the upright position. Immediately upon doing so I got several UMC fault warnings. Unplugged the UMC from the wall and everything is working fine now. SC is going to replace the UMC proactively.
 

ChrisPDX

Member
Mar 19, 2013
249
210
Hillsboro, OR
I had the same problem too. Within a 1.5 week period, the car didn't start the scheduled charge until after I connected via the app. Tesla service thought it could be my 240v power and had me test with 120v for awhile. However, that was a month ago and the problem hasn't reappeared since. I just assumed it was a firmware issue since it upgraded to a newer version while I was doing the 120v test, but now I'm wondering if that's not the cause and I have a faulty UMC. Only way to know for sure is if the issue comes back.
 

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