I have a mystery motor that was amongst some of the earliest devices detected in my house. The weird part is that it ONLY comes on when I turn on any of the stove elements. The elements themselves have also been detected and I’m working on grouping them, but that’s separate.
This motor NEVER comes on without the stove being turned on, and it seems to fit the signature of a motor (heavier load at the beginning, and then tapers down to a steady rate. It starts around 120 watts and then slowly drops to around 105-107 before eventually shutting off. It sometimes only runs for a few minutes, sometimes for up to an hour before sense detects it as being off…although I suspect sometimes the off detection may be delayed.