In RM 4.0, this is how I handle Washer/Dryer notifications based on the Power usage dropping below a threshold (e.g. 3.0 Watts) for a certain period of time (e.g 32 seconds.) If the power level goes back up above the threshold within those 32 seconds, everything resets and waits for the power to drop below the threshold again.
You have to play around with the Power Threshold and the Delay Time to prevent false alarms for your particular washer and dryer.
