I see this sort of question on the Facebook page a lot ( https://m.facebook.com/photo.php?fbid=10214326082328026&id=1295853163&set=gm.348200842317194&source=48) so thought I’d post something here in case anyone might stumble across it later.
If you have an unidentified device with a flatline, don’t waste a lot of time wondering what it might be that’s drawing a constant amount of power for so long. Sometimes It’s not. What you may be seeing is a shutoff anomaly - Sense hasn’t figured out that the device has shut off, perhaps because of noise around the time it actually shut off.
Here’s an example from my refrigerator signature:
It seems like sometimes Sense will latch on to some power draw, either always on or perhaps even non-existent, and ascribe it to a device until it falls off or you tell it that it’s not on. So far, I don’t think human intervention from tech support has managed to come up with a solution for this, it’s purely an unpreventable A.I. failure.
And here’s an example of the actual device signature, which Sense gets right maybe 75% of the time: