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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1 Answer

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.

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Is the humidifier supposed to turn on when the furnace does. Does it turn on more often when the temperature outside is higher.


Hello, Yes the humidifier should turn on when the blower motor on your furnace kicks on, this way you are only using water and power when the furnace is on instead of wasting it when when the furnace is off. Regardless of outside temperature the humidifier will only turn on and off with your furnace.

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Feb 03, 2010 | Aprilaire 550 Humidifier

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What should my humidifier be set at for the winter?


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I'm no expert, but those who are seem to agree that the first thing to check is your evaporator panel. Aprilaire recommends replacing it annually--so if you haven't replaced it recently, that would be the first step to take. Next, check the power supply to your Aprilaire unit. Turn the humidistat to 0%, and then turn it slowly back toward 35% until you hear a click at the unit. If you don't hear a click, you'll want to check that the unit is in fact getting electric power (you may want to get an electrician or furnace tech to do this). If you do hear the click, the next thing to check is whether you have sufficient water flow to your Aprilaire unit. On mine, I had to adjust my water supply saddle valve, as well as the inline valve on the discharge side of the solenoid (see prior post from this morning)--and this seemed to clear the lines and restore water flow. Once you achieve proper water flow, you will probably want to set your humidistat at 35% for winter temps of around 20 degrees F--but be sure to adjust it downward for colder weather. Comments, anyone?

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