Wall charger overheating, charging slowed

[DaBagBoy]

For the past 3 nights my CT slows charging from 48a to 24a reporting a "Charger Overheating" error. It's a 220v x 60 amp circuit attached to a 2018 Tesla wall charger installed for my Model 3 installed in 2018. The electrician installed a new meter and breaker box the wiring runs about 50 feet in my basement and goes out to the garage.
I've entered a SC ticket and called an electrician.

 

[mongo]

For the past 3 nights my CT slows charging from 48a to 24a reporting a "Charger Overheating" error. It's a 220v x 60 amp circuit attached to a 2018 Tesla wall charger installed for my Model 3 installed in 2018. The electrician installed a new meter and breaker box the wiring runs about 50 feet in my basement and goes out to the garage.
I've entered a SC ticket and called an electrician.

How hot is your garage?
If the WC has been untouched since 2018, the connections might be getting loose.
One thing you can check is the reported voltage at low and heavy charge currents. 239V @ 24A looks good, but depends on what the idle voltage is.

 

[DaBagBoy]

Thanks, the garage is not that hot at all yet, 55 degrees overnight recently. I'm not sure how to " check is the reported voltage at low and heavy charge "
It starts off at 48a but at some point overnight slows down?

 

[mongo]

Thanks, the garage is not that hot at all yet, 55 degrees overnight recently. I'm not sure how to " check is the reported voltage at low and heavy charge "
It starts off at 48a but at some point overnight slows down?

With the app or center display, crank the charge current down to 5A, note the voltage, then go to 45 and note it again.

I have a 9 Volt drop from 40A, so about 0.25 Ohms of resistance which isn't great, but it's a long run from the transformer.
A high drop can indicate a bad connection which creates heat.

 

[RonSol]

I had this same issue. WC installed in 2019 and started getting the same error. Connections were torqued to spec and problem went away.

 

[DaBagBoy]

Thanks I have an electrician buddy coming by tomorrow and will look for loose connections as I did test and it dropped from 241v to 228v

 

[mongo]

Thanks I have an electrician buddy coming by tomorrow and will look for loose connections as I did test and it dropped from 241v to 228v

That's a lot, especially if it's an attached garage. If the 48A voltage gets lower as it charges that really points to a bad connection.

 

[BlueLightning]

For the past 3 nights my CT slows charging from 48a to 24a reporting a "Charger Overheating" error. It's a 220v x 60 amp circuit attached to a 2018 Tesla wall charger installed for my Model 3 installed in 2018. The electrician installed a new meter and breaker box the wiring runs about 50 feet in my basement and goes out to the garage.
I've entered a SC ticket and called an electrician.

Check out this post

At OpenVolt, we’re passionate about electronics—especially when it comes to repairing and repurposing gear. That curiosity drives us to learn how things work and figure out how to fix them when they don’t. Over time, we’ve taken apart and refurbished several wall connectors, and we’ve documented some of that process in our repair videos. If you’re curious, feel free to check out one of them here:



That said, the Universal Wall Connector is relatively new, and it looks like Tesla has applied lessons from past designs to make this version even more robust. Still, if anyone here runs into issues with their unit, don’t hesitate to reach out or tag me. I’d be very interested in seeing what kind of problems—if any—emerge with this newer hardware.

 

[lrpena]

For the past 3 nights my CT slows charging from 48a to 24a reporting a "Charger Overheating" error. It's a 220v x 60 amp circuit attached to a 2018 Tesla wall charger installed for my Model 3 installed in 2018. The electrician installed a new meter and breaker box the wiring runs about 50 feet in my basement and goes out to the garage.
I've entered a SC ticket and called an electrician.

Check Cable connections torque to proper Specs. i believe it's 50lbs

 

[henchman24]

Check Cable connections torque to proper Specs. i believe it's 50lbs

Just to clarify for OP... it is 50 lbf-in (5.6 Nm). Don't go torquing those tiny bolts to 50 lbf-ft... you'll bust everything.

Odds are the screws just lost a bit of connection through the years an heat cycles. Checking the connections should make it clear.

 

[DaBagBoy]

Thanks for all of your help w this! I'm pretty sure it's a loose nut as you all described- but for the next diy - my buddy has now stopped out twice - be warned the first time he left cuz he left he's star but at home and I didn't he's the right size one - second time another cover has "safety" screws - no way I have them - but he's an electrician in the state prison system- so he had or leave to get that bit.

Only good thing as he can now bring his kids over for a cybertruck ride next week - I can slow my charges for a bit- maybe the lesson is to dial back to 24 or 36a when not "needed"?

 

[mongo]

Thanks for all of your help w this! I'm pretty sure it's a loose nut as you all described- but for the next diy - my buddy has now stopped out twice - be warned the first time he left cuz he left he's star but at home and I didn't he's the right size one - second time another cover has "safety" screws - no way I have them - but he's an electrician in the state prison system- so he had or leave to get that bit.

Only good thing as he can now bring his kids over for a cybertruck ride next week - I can slow my charges for a bit- maybe the lesson is to dial back to 24 or 36a when not "needed"?

I'd dial it back or use the mobile connector until it get fixed. Hopefully, he digs up his T10 and T20 security torx for the next trip.