There is a microswitch that is triggered when the reseivoir is in place, it is attached to a small wire to the control board. I disconnected it from the board and tested it to verify it is the switch. If the circuit is open, then it stops the humidifier. I was thinking of splicing in the relay switch in series. I did think of doing a 110v relay for the outlet, though could't find a good guide on doing it.