I have an Aprilaire 560 and it isn't working. I was just troubleshooting it and found that by jumping the two screws on the manual humidistat it started to work. Does this mean that the humidistat is bad? The water supply get to the solenoid and after I jumped the humidistat, it started to flow into the unit.

Humidifiers - Aprilaire - 550 Humidifier