Some say that there is an issue with "overheating" that is fixed by a firmware update. Connect to your device via Wifi and see if you need to do anything to download the latest firmware.
I don't have one myself, so don't know how the updates work. I think that they would be automatic, but best to check that it is connected to Wifi and look around for updates.
Even if it auto-updates, Wifi could be disconnected.
I'm having this same issue of ramping to 16/17A then back to zero and repeating. Also getting three red blinks high temperature detected every night since 7/6 after about an hour of charging at 48A. At that time, it drops to 24A half speed with overheating red blinks. Had Tesla pull charging logs to determine the cause. Before I called, I pulled the faceplate off and made sure all three wires were properly tight and touching the contacts. I've had multiple firmware updates since and it's showing 0.8.58 on the wizard but the home charging rep said we are now up to 8.1? Hoping to hear from them today on what the logs are showing. One user on FB with a M3 reported having to have the PCS power conversion system replaced in the car. They've had multiple reports the past couple weeks of this "overheating" issue on the Gen 3 WC.
I ended up re-booting my car - and working fine now... Does the Gen3 home charger automatically upgrade the firmware? or do you have to manually update? Don't want to have to call the customer service number each time...
I'm still having issues, but at least it's charging. I haven't had it stop with the red blinking, but it's currently dropped to 24A and charging at 6 kW. Very frustrating... second guessing my choice paying Tesla for this piece of junk.Firmware is supposed to be automatically updated as long as it's connected to the internet. I've gotten new firmware but still having the issue. 0.8.58
If you connect it to the WiFi and scan the QR code, or go into 192.168.92.1 you should see it on the bottom, Firmware Version (this is an older screenshot)I had the 0-17 amp thing again tonight. Rebooted the car and it was back to 48 amps. I hope this isn't a regular thing.
BTW, how do you tell what firmware the HPWC is running?