Buck Turgidson wrote:
I have an AprilAire. It seems that when I turn the humidistat to the
point of right where it clicks on, the humidifier runs with each and
every furnace cycle. If I turn it until it just clicks off, it never
runs with any furnace cycle.

I guess I would expect that setting it right at the brink would make
the humidifier run occasionally. But my house goes from either being
a desert, to having moss and ferns growing on the walls.

Should it behave like this, or do I need to replace the humidistat?
I would be interested in hearing from other AprilAire owners.

I have the model that sits on the cold-air return side. The
humidistat is also on the cold-air return duct. Maybe that's part of
the problem. Maybe it should be on the hot side.

You really need to check the installation manual to determine how that
should be set up. On mine the sensor is not a humidity sensor it is a out
side temperature sensor that reduces the humidity setting when the
temperature outside gets cold to avoid condensation on the windows. Your
owners manual should give you some information as well. Yours may be
different than mine.

Either way I don't think it should not run unless the indoor humidity is
rather high already. You may have a bad wire or connection.

--
Joseph Meehan

26 + 6 = 1 It's Irish Math