Question about Aprilaire 550 Humidifier
There are no clicks when I turn the humidistat dial while the furnace fan is running. Water flows into selonoid but not out of it. Cleaned all the mineral build up. Still no flow.
Last summer we had to replace the circuit board on the furnace. May be the technician did not hook the selonoid right. There are 2 wires that come out of the selonoid (Red and Orange). Red is connected to the HUM on the circuit board. The Orange is hanging free. Is that right?
What might be wrong here?
I just solved a problem with mine today. One of my low voltage power wires to the humidity control had a bad connection. I reconnected it and I could again hear the solenoid valve clicking as I adjusted the dial control.
I found the problem with a voltmeter: there was voltage at the power terminals on the humidity control terminal board, but there was no voltage at the solenoid valve terminals. It was hard to push my big wires into the terminal board, but I finally secured the connection!
Posted on Jan 28, 2009
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Posted on Jan 02, 2017
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