I took delivery of my EQA350 4matic two weeks ago and had only done short journeys in it until yesterday. Charging at home (BP Pulse wallbox) had been no problem for the first 164 miles of ownership but having completed a 190 mile round trip this morning I got home with 12% charge remaining so immediately put the car on charge - all seemed as normal, so I closed the garage door. One minute later, my MMe phone app told me that there was a charging error and it had stopped charging. I tried a few times more without success to get it to charge for more than one minute, but failed, so I called MB Roadside Assistance who advised that they would send out a MB specialist (who duly arrived 5 hours later!). In the meanwhile, about 1.5 hours after leaving the car not charging but still plugged into the wallbox, my phone bleeped and told me that the charging had commenced. I did let MB Roadside Assistance know but they said they would not cancel the callout so it could be checked. The MB specialist told me that the battery cannot accept charge when it is too hot or too cold - and mine would have been very hot having just done 88 miles on the motorway. Apparently you can pre-prepare the battery for charging by telling it to heat or cool before arrival at a charging station - he wasn't sure exactly what I had to do to set this up but it is in the navigation system within MBUX - he suggested that I read the owners manual and it must be in there. I wish I had known this, but I wonder if it is what was causing your problem?
