Question about Aprilaire 550 Humidifier

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Noisey humidifier every time humidifier kicks on, it has a very loud noise like a 1 cylinder engine.

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  • pinkgenome Feb 08, 2008

    one humidifier is hot, another is cold. we have horrible sounds like an airplane going overhead. what is wrong?

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Not sure what type of humidifier you have but if is a power humidifier like the April 700 or 760 they do have a blower motor and it may be the fan blade is broken.But if you have a bypass humidifier is posible that your water solenoid may be making noise because of to much water pressure there is not much to a bypass humidifier, you may want to close the water supply valve a little at a time se if the noise goes away.

Posted on Feb 09, 2009

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I have a sunbeam sul2512um ultra sonic humidifier . I have had it for a less than a year . When I turn it on it makes a very loud noise where the mist comes at the base . Is there anything I can do to...
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yes it should be bypass but solenoid could be trying to open but the voltage to it may be to low if you have 24v ac power at the 2 small wires. but to change shut down power to furnace and water to humidifier.you loosen the 2 compression nuts unwire they cant be reversed so dont worry then 2 mounting screws then reverse to install
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Dec 17, 2009 • Aprilaire 550 Humidifier
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Bad Problem with solenoid valve.
If the valve noise is excessive, or more than it was originally, then yes, replace the valve.

If the noise is no worse than it was originally, then you may be overly sensitive to the noise its making.

Also, check that the valve has not shifted slightly in such a way that it's opening and closing rattles it against something that it didn't used to rattle against. A sheet metal panel will amplify the valve opening and closing.

Let me know what you find.
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If you disconnect the low voltage wiring from the solenoid valve and you still hear the noise, then its not the solenoid valve.
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Apr 06, 2009 • Aprilaire 700 Humidifier
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We recently had the same problem. After cleaning both the furnace filter and the humidifier water panel, the clicking noise (electric air filter) and the loud bang went away.
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Nov 30, 2008 • Aprilaire 550 Humidifier
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Loud "Glonk" when humidifier turns off
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