I have an Aprilaire 700 whole house humidifier with a manual mode humidistat on the return. I noticed that the unit was draining water even when the heater/fan was off. Is this expected? I just hear it constantly draining, which I'm guessing is due to low humidity in the return? What's the point of draining when the fan is off?
Additional details: If I lower the threshold on the humidistat, I hear the solenoid engage (or disengage?) and the unit stops draining. There are no noticeable leaks. The only water I see is what comes out of the drain pipe.