I like humming but I don’t like my humidifier humming, please help!

Consumer question:

We have an Aprilaire model 550 Humidifier attached to our Central Air/Heat House system (also attached is a Aprilaire 2400 Air Cleaner). Both have worked smoothly until a couple of days ago. Water used to drain periodically into a corner sink like it was supposed to but now no water is draining whatsoever, and the humidifier makes a noise every once in a while like a little brief hum as if it is trying to run but cannot. I know the Water panel needs to be replaced, and I was wondering if this could be the cause of the problem or if it is something more serious. I would appreciate any insight you can give me. (if it matters, the humidifier is set to 35%, as is recommended for the current temperature.) Also, I tried to find the test/reset switch to test the humidifier, but could not find it on the unit. Any idea where it is typically located on this model?

Aprilaires’ response:

Thank you for contacting us regarding your model 550 humidifier. If there is no water coming from the unit when the furnace is on and the control is making a call for humidity, then the solenoid valve is not opening. Since you are hearing an occasional hum from the humidifier, it sounds like the solenoid is trying to open but cannot. The condition of the water panel would have no bearing on the solenoid’s ability to open. In this case we would recommend contacting your contractor to schedule a service call for your humidifier.

Additionally, to better understand why your unit is not operating, you have the option to call our technical support department at 1-800-334-6011 to troubleshoot the unit with one of our technicians over the phone. The technician may be able to diagnose what the problem is and point you in the right direction regarding service.

Our tech support department is available Monday through Friday, 7 am to 5 pm CST.

If you have any further questions regarding this or any of our products, please feel free to contact our customer service department at your earliest convenience.

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