I purchased my 3rd gen wall charger in March, right when they were released. It was fine until about 2 weeks ago when I got my first 3 blinking red lights and charger was definitely hot. Cleared it, error/heat came back again this past Friday. Called Wall Charger support today (thanks everyone for the number!). They said they were definitely having issues with these chargers overheating and that 70% can be fixed via firmware. After checking my firmware, they found I was already on the correct firmware so they opened a case. They said the case will get routed to another group and they would check the charger and decide if they should replace it. He didn't say this directly, but he seemed to imply that was the path they were going to take. It will take 2-3 days for them to respond by email. (blah) He also said that I should ignore any email that says I have to return your defective charger before they will send out the replacement. He said that is inaccurate. The replacement charger will take 5 days to ship/receive from the date I hear from the team he was sending the case to.
So....while I am happy that it seems like the problem will get resolved, I'm not thrilled that the units are defective and it does suck that it's going to take about 10 days in total to get my unit replaced. I live 6 miles from a supercharger so I guess I will pop over there a few times.
On a side note, the service rep was excellent. Tesla's service is definitely less than accessible and is often branded "poor", but this rep (maybe the entire team?) was aware of the issue, new how to quickly diagnose the problem, and got me to the next step promptly. Hopefully the rest of the handling goes this well.
Note, the (510) 249-2490 Option 2 center is open 8-5 pacific time / 11-8 Eastern.
Have your Wall Charger serial number handy and have the unit powered on, connected to WiFi so they can connect to it. I also have to leave it on in case the 2nd level team wants to connect to it for further diagnosis. He said there wasn't any danger in doing this.