Unfortunately, my fairphone got wet a few days ago. I did everything I could to dry it without causing any damages. I changed the display and the USB port, but I still get this error message with a very loud and annoying sound. The picture is attached.
This looks like a pretty low-level problem. For an explanation of Negative Temperature Coefficient you can read up here, but it probably won’t be of immediate use.
Does this happen when charging the phone or when it gets a bit hot?
I would think you’ll need to get advice from official Support. See contactsupport
FYI and you might want to pass this on to Support, this message and the loud annoying noise has been equated or associated with another one that’s been waking people up at night.