Question about Aprilaire 350 Humidifier

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Hello, I have an Aprilaire 350, and the "solonoid" needs to be replaced. Exactly what is the part #, I would like to do this myself

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I dont knnow the part #, but to be honest with you every single residential humidifier with a soleniod valve uses the exact same valve. Same 1/4' inlet and oulet and same 2 hole mounting pattern. The only difference between humidifiers is basically the bigger the unit the more humidity it can produce. Hope this helps. Steve

Posted on Dec 22, 2008


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I have an Aprilair humidifier that started making a loud humming/buzzing noise. The water runs OK but the soloniod is burning hot to the touch. Is this normal?

Yeah they do need to be replaced from time to time. Make sure you get a water test kit and check your water hardness. You may need a whole home water filter if it is outside of normal ranges. A pretty easy DIY project and relatively inexpensive at the big box stores

Nov 29, 2013 | Aprilaire 700 Humidifier

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Aprilaire 550 not turning on

Hello, apply power directly from transformer to solenoid valve, it it does not turn on the solenoid valve must be replaced. If there is no voltage to the solenoid then follow the wires back and see where there is no voltage.

Nov 18, 2011 | Aprilaire 550 Humidifier

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Have Aprilaire 600. Water will not flow thru unit

Hello, most likely the solenoid is bad and must be replaced. If you are getting 24 volts to the solenoid and it does not open replace the solenoid valve.

Feb 13, 2011 | Aprilaire Humidifiers

1 Answer

My Aprilaire 600 is dripping from the front toward the bottom... Can I fix it myself or do I need my maintenance guy?

Hello, check to make sure that the drain line is not blocked, this could cause the water to back up in the humidifier and leak, also make sure the water panel is clean and free of any mineral deposits.

Feb 09, 2011 | Aprilaire 600 Humidifier

1 Answer

Hello! Humidifier quit working. Turned dial to test and nothing. Usually I hear the humidifier working if I increase the dial to a higher level but nothing. Could it be the solonoid is gone? Thanks!

if you hear a "click" at the unit when you increase the demand for humidity it could be a clogged solenoid valve. If you heart nothing this could indicate a power problem. turn the humidistat to the highest setting and verify the proper voltage is available at the solenoid, if so, the solenoid needs to be replace. hope this helps.


Nov 25, 2010 | Aprilaire 550 Humidifier

1 Answer

Hissing sound

that is normal if it is too loud the filter inside may be dirty and need replaced they need replaced ever heating season

Oct 21, 2009 | Aprilaire 550 Humidifier

1 Answer

No water

could also be a clogged filter or orifice. take input line off solonoid and check.clean filter, blow thru orifice. clean with small needle or buy new one.

Dec 20, 2008 | Aprilaire 700 Humidifier

1 Answer

After one season the model 700 doesn't turn on

clogged solonoid? clean filter and orifice

Dec 13, 2008 | Aprilaire 700 Humidifier

2 Answers

Aprilaire 600 humidifier solonoid valve chattering in sync with d10 led

I fixed my problem by ordering a new control unit (model 56) from IAQSOURCE. Installing the control unit took a few mintues, and once the new control module was installed, I've had no more problems. The URL is as follows:

Oct 12, 2007 | Aprilaire 600 Humidifier

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