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My humidifiers make a humming sound when on

Within seconds of the furnace coming on, the humidifiers begin to make a humming sound, which can be heard throughout the house. Solenoid valves have been checked, filters have been changed, tubes and cords have been appropriately strapped. Still no relief. The only way to make the sound go away is to turn off the humidifiers, leaving my home much too dry during the winter season. Both units are relatively new: the Generalaire is two years old and the Aprilaire is one year old. I have run each humidifier separately and each of them makes a humming sound.

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6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

JMuskovitz
  • 135 Answers

SOURCE: Aprilaire 760 Humidifier water continues to run

You need to determine whether the problem is in the solenoid or in the furnace electronics. You could put a voltmeter on the solenoid connection to see if the furnace is still holding the solenoid open after the blower stops. This will tell you whether it is the solenoid or not.

Posted on Feb 19, 2007

SOURCE: Leaking humidifier

Check for an obstructed drain line.

Posted on Mar 04, 2008

  • 2 Answers

SOURCE: What should my humidifier be set at for the winter?

Hi, Jennifer:

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?

Posted on Dec 15, 2008

  • 232 Answers

SOURCE: Testing a Aprilaire Humidifier 600 Controller

if it works in the test mode then it should be okay but you can get a humidity gauge from radio shack and set in the house to see how high or low its is. the humidifier is only going to give a max of 45% humidity

Posted on Dec 31, 2009

  • 415 Answers

SOURCE: What is the saddle valve?

Your humidifier will have either a copper or plastic tubing attached to it. This tubing is the water tubing. If you follow that line to where it "taps" into a water line (near the water heater or a water line under your house), there should be a water shut-off valve. The water shut-off valve could be any type of valve but is normally a saddle valve. You could skip the step of shutting off this valve; however, it is good practice to shut the valve off for two reasons: 1. in the event of a water leak, you will be able to easily locate the valve to shut off the water. 2. if the valve is not "excercised" from time to time, the seals will dry rot and the valve will not be capable of doing it's job when the need arises.

Here is a video showing you how to trace your water line to your saddle valve. There is additional information on the video that you might find helpful as well.

Posted on May 07, 2010

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1 Answer

Furnace mounted humidifier when set thermostat to operate automatically it kicks the solenoid on but when the furnace shuts off the solenoid stays on When I turn it off at the thermostat it shuts off


Without knowing the exact humidifier and how it's wired one can only guess.

There are many different ways to wire a humidifier, one method involves the use of a current sensing relay monitoring the operation of the furnace fan motor. Another uses the HUM terminals on the furnace to control the humidifier.

Has the humidifier ever worked properly? If so, a component has failed. If not, it wired incorrectly and you need to refer back to your installation manual.

Oct 28, 2016 | Humidifiers

1 Answer

I have a 1099 general powered humidifier making a loud humming noise.


there are no moving parts in that humidifier other than the solenoid and it only moves open or closed are you sure the noise isn't caused by something else, maybe something close or even the furnace

Feb 23, 2014 | General Filters 1099-LH Humidifier

1 Answer

If i hook my Aprilaire 400 Manual (not auto/digital) humidifier up straight to a 24v wall outlet instead of to the furnace, will it still work correctly? Or does it need to be powered by the furnace to...


Your humidifier is a bypass type. The only voltage needed is 24vac to open the water valve. Air only flows through the humidifier when the furnace blower is running, and the wet pad will add very little humidity if the furnace is not running and heating the air before flowing through the wet pad in the humidifier.
It is best the water valve is only energized when the furnace is running. Some furnaces have a connector on their control boards labeled HUM for this purpose. Test it's voltage when the furnace is running because some will output 110vac instead of 24vac you need.

Jan 31, 2013 | Aprilaire 400 Humidifier

1 Answer

Have a aprilair 550 for some time. Installed a new Lennox G61MP furnace and the technitions failed to reconnect the wiring that powers the humidifier. Need wiring schematic. Does humidifier transformer get...


Hello, yes the transformer will get a 120 volts from the Furnaces control board, there should be a terminal labeled HUM on the control board. You need to bring 2 wires one from HUM and one from a nuetral tap on the board to the line side of the transformer, this way every time the blower motor on the Furnace turns on the humidifier will aswell.

Aug 23, 2011 | Aprilaire 550 Humidifier

1 Answer

The display is on only when the furnace is burning gas and the blower is on. Is thisthe normal operating mode?


Is Sound like your R and C term are beeing power from the heating side of the furnace board. It need a 120 to 24 volt transformor to give the hum stat a constant 24 volts. See if that helps

Nov 04, 2010 | Aprilaire 400 Humidifier

1 Answer

Do I need a transformer if my furnace has HUM port


Yes you still need a transformer the hum. port on the furnace goes to the 24 volt transformer. one leg of the primary side goes to the transformer and the other leg of the primary goes to the neutral on the board. Then you have your 24 volt terminals one goes directly to the humidifier and the other goes to the humidistat the other wire from the humidifier goes to the humidistat.

Jan 25, 2010 | Honeywell HE260A1010 Whole House...

1 Answer

Why two 24 Vac on aprilaire 700's control unit?


Okay, I looked up the installation manual online to see exactly what you are working with.
Yes the R anc C need to be hooked to the transformer supplied with the unit. The primary 120v side needs to be hooked into the power coming into the furnace. this can easily be done were the L and N get hooked into your furnace or circuit board on the furnace. This will provide the contiuous power to the unit. Preferably you will hook this after the door switch of the furnace so that you will kill the power toit if you take the blower door off.
The ODT terminals are for the outdoor sensor if you want to hook that up it will vary the humidiy in your home according to the outdoor temperature then.
Now the W/G and Cf terminals. If you have 24v coming from the HUM terminals of your furnace you DO NOT need a second transformer. You must check your furnace manual or check the voltage to them with the furnace blower energized. The HUM terminals will only have power to them when the blower should be running.
If the HUM terminals are 120v then you need to get another transformer and hook up the primary side to the HUM terminals so it is powered only when the the blower is running. Hook the secondary side to the W/G and Cf terminals.
So bottom line is that you need to figure out what voltage your furnace is giving to the HUM terminals and then go from there. Some times the EAC terminals or the ACC terminals will be 24v on the furnace board. Either of them could be used also, as they are only energized when the blower is running also.

Heatman101

Jan 25, 2010 | Aprilaire 700 Humidifier

1 Answer

When I turn on the humidifier it shuts off the furnace


some one has the humidifier hooked up to the R and W on the furnace.
1. it should be hooked up to its own transformer or to a proper low voltage terminal on the circuit board(beware there are high voltage HUM terminals) markd HUM and the other wire to C or the common.
2. You could hook the wire to W or white and C Common but I would rather see a seperate transformer since there is a possiblity this could cause solenoid chattering

Dec 11, 2009 | Aprilaire 550 Humidifier

1 Answer

Aprilaire 550 doesn't seem to be getting power


See if you have a screw marked EAC This to power an Electronic Air Cleaner unlike the HUM it also gets 120VAC only when the fan comes on. Not sure what make of furnace you have but if your heat is working OK don'tn change the control board the can be very expensive. there are other ways to wire humidifiers without using the HUN screw

Dec 23, 2007 | Aprilaire 550 Humidifier

1 Answer

Wiring problem


Sounds like you may have put 120v through a 24v solenoid and humidistat.
Is the HUM terminal on the furnace 120v or 24v?
If it is a 120v terminal you will need a 120x24v transformer and a new solenoid and maybe a new humidistat.

Dec 19, 2007 | Honeywell HE360A1027 Whole House...

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