Question about Aprilaire 700 Humidifier

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Fan making loud humming noise

Do I need to adjust?

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  • Aprilaire Master
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Without power applied to the Humidifier, can you spin the fan blade easily? Or does it seem seized?

Posted on May 17, 2014

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Posted on Jan 02, 2017

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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

I have an Aprilair humidifier that started making a loud humming/buzzing noise. The water runs OK but the soloniod is burning hot to the touch. Is this normal?


Yeah they do need to be replaced from time to time. Make sure you get a water test kit and check your water hardness. You may need a whole home water filter if it is outside of normal ranges. A pretty easy DIY project and relatively inexpensive at the big box stores

Nov 29, 2013 | Aprilaire 700 Humidifier

1 Answer

Rattle noise


if you just got it check for packing material stuck around the fan area
if there is nothing , then take it back for a warranty exchange as it is not as described ---quiet

Jun 26, 2017 | Honeywell Humidifiers

1 Answer

Have an HE225A, B By-pass Flow thru humidifier about 9 yrs old. Just change the antimicrobial pad with recommended Aprilair 110/220 and when the furnace comes on, there is a loud, hum-like, vibrating noise...


Make sure the new pad you installed is in the right position. The pad is marked with a black dot about the size of a quarter. This end should be up for proper water flow through the pad.I fwater flow is being restricted at the pad the vibrating nosie that you are hearing is the dry portion of the pad vibrating agaist the platic housing of the humidifier. This noise stops once the pad has absorb enough water in this area of the pad.

Jan 23, 2011 | Honeywell HE220A1019 Whole House...

2 Answers

Hello kitty humidefier has started making a loud noise and sometimes it goes off but more often noise stays on longer. Almost sounds like a loud fan. What do I do?


This sounds like the electric motor bushings are worn which will cause vibration throughout the unit. If it is relatively new I recommend checking the warranty information and returning it to the retailer for a replacement. If you have gotten your money out of it but cannot tolerate the noise, then a replacement is in order as well. The cost of replacing the motor and installing it will most likely exceed the cost of a new humidifer.

Dec 08, 2010 | Crane Hello Kitty Humidifier

2 Answers

My aprilair's humidifier motor began to make loud squealing noise


Put some lubricant, oil, WD40, etc. on shaft of fan. Spin the fan with your finger and work the oil into the shaft until the fan spins freely again. Reassemble and problem will be gone for 2-3 weeks. Repeat again until you want to replace the fan motor.

Dec 31, 2009 | Aprilaire 700 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

1 Answer

The humidifier is only a month old, but it is making a loud rattling noise


take the tank off and the fan unit housing. inside you'll see a circular filter that goes into the water sump. make sure it isn't falling apart and hitting the fan blades.

Oct 20, 2009 | Hunter 33201 Humidifier

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.

Apr 06, 2009 | Aprilaire 700 Humidifier

2 Answers

Loud "Glonk" when humidifier turns off


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.

Mar 12, 2008 | Aprilaire 700 Humidifier

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