Question about Aprilaire 550 Humidifier

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Loud clicking, banging noise

When furnace kicks on and humidifier turns on a couple of minutes when unit clicks off (Aprilaire) a loud bang is herd through out the house. When next to unit the solinode seems to be clicking, in results sets a loud bang in duct work herd on all upper floors..What do I do to stop this noise, replace solinode, clean it? Help please driving me crazy..Just moved into this home!!

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  • Anonymous Dec 25, 2008

    i have the same problem on a 560. I suspect it's the solenoid. I'll probably call and replace the solenoid.

  • PJ03 Dec 28, 2008

    I have a 550 with the same issue, had to turn it off until I have someone come look at it.

  • ombps Dec 29, 2008

    I hear the water running as well. Our house is built solidly and it doesn't seem like it should be that loud. The lound bang/thud wakes me up at times.

  • rovertinca Feb 15, 2009

    when the water flow shuts off, loud bang

  • rstanek777 Feb 28, 2009

    It's a combination clicking and banging noise... It continues anywhere from 5 to 30 seconds prior to the furnace finishing it's heating cycle and shutting off. It doesn't happen all the time.. It's very inconsistent but has been a chronic problem happening at least once a week for the past year. I'm certain it's the Aprilaire humidifier because I have been near the furnace when it has occurred.. It doesn't occur during summer when the air conditioner runs..

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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.

Posted on Feb 01, 2009

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My aprilaire model 560 is constantly clicking loudly. I read about the click point but despite where I set the dial it is constantly clicking whenever the furnace kicks on. What can I do?


Check all wire connections for tightness. Those solenoids on the humidifiers will eventually need to be replaced. Try turning the dial all the way up to the test position if it is still clicking you may just need a new solenoid.

Dec 10, 2013 | Aprilaire 600 Humidifier

1 Answer

760 aprilaire humidifier does not let water to the filter. I have cleaned and checked the lines in and out of solenoid.


Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Your Aprilaire Humidifier is designed to operate in conjunction with your furnace blower motor. Most installers wire a humidifier to operate when the furnace is calling for heat. To determine if your Aprilaire Humidifier is maintaining proper humidity, turn up the heat temperature 5 degrees above the current room temperature on your thermostat and set your humidifier control to call for humidity. The humidifier control is located on the cold air return duct. To set your humidifier control to call for humidity, turn the control dial to the off position and slowly rotate the dial until you hear a “click” on the control. You should also hear a click at the solenoid valve located on your Aprilaire unit. The humidifier control will have a click point at the current relative humidity level in your home. If the current relative humidity is 45% or the outdoor temperature is above 60F, the control will only operate the humidifier in the test mode.
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  1. No click at the solenoid valve indicates an electrical problem. Contact your heating and air conditioning dealer to further check the electrical components of your Aprilaire Humidifier.

  1. The click sound at the solenoid valve indicates there is electricity to the solenoid valve. By turning the dial of your humidifier control to a setting above the “click point” you should see water coming out of the drain line within a few minutes which would indicate your humidifier is working.

  1. If the solenoid valve makes a click sound and there is no water draining from the unit, this would indicate the flow of water is being obstructed.

1. To determine if water flow is being obstructed, turn the dial of your humidifier control to the off position. The first location you would want to check for an obstruction would be at the saddle valve located on the water line supplying water to the humidifier. When checking the saddle valve, you want to make sure it is completely open. This can be done by turning the valve all the way to the left. If anything is clogged, it can be dislodged by turning the saddle valve all the way to the right and back to the left. Once this is done, turn the humidifier control dial above the click point and you should see water coming out the drain line.


If water is still not coming out of the drain, check the orifice and in-line strainer to make sure they are not clogged. The orifice is located in the tube on the discharge side of the solenoid valve and the in-line strainer is located on the inlet side of the solenoid valve. You may clear the orifice by inserting a needle through the small opening. Clean the strainer by running it under warm water to dislodge deposits or replace. After clearing and re-installing the orifice and strainer (be sure to double wrench all water connections), turn the humidifier control dial above the click point and you should see water coming out the drain line.

Mar 10, 2010 | Aprilaire Humidifiers

1 Answer

Loud vibrating noise when the furnace blower starts up.


Try closing damper slightly between humidifier and furnace????

Feb 03, 2010 | Aprilaire 550 Humidifier

1 Answer

My Aprilaire 560 doesn't shut off even if the blower is off.


My Aprilair 560 turns on and off repeatedly.Making a loud banging sound.Changed my water valve worked 1 day and started agin.

Dec 20, 2009 | Aprilaire 550 Humidifier

1 Answer

Aprilaire 550 makes extremely loud grinding noise when turned on


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

Dec 17, 2009 | Aprilaire 550 Humidifier

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Loud clicking and banging, A700 doesn`t work


You have a faulty humidistat

Greg Sunsetmech

Dec 13, 2009 | Aprilaire 700 Humidifier

2 Answers

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.

Dec 12, 2009 | Honeywell Power Humidifier: Furnace...

1 Answer

Aprilaire 760 furnace humidifier makes a loud screeching sound.


A bad circuit board should not make any noises. A bad solenoid valve could make a loud buzzing noise. If the noise is a squealing noise then you have defective bearings in the blower motor.
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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Loud noise


Replace the water valve... It"s vibrating when closing. Do you have hot water feeding the unit?

Oct 22, 2008 | Aprilaire 550 Humidifier

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Try turning the water valve going to the soleniod down. There may be too much pressure. You may have to replace solenoid one more time after making the adjustment.

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