Temperature warning when charging, too low or too high?

I had this same issue after replacing a charge port on the A5 A520

I finally found the Thermistor near the charge port. It is covered in a somewhat clear glue. Just heat up the glue with a heatgun and you can scrape off the glue. 200-230C should be plenty for this. In my case after scraping off the glue, I found that the Thermistor was not actually soldered to the board, but loosely just glued on to the board.

Simply re-solder that darn thing back on, and you should be good to go.

If you get an error, temp is too low, this is likely your issue. If you get an error, temp is too high, you will likely need to replace this, or there is a secondary issue.

Here is an image showing it’s location.

Hope it helps