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I have a Kenmore Quiet Comfort Electronic humidifier, model 758.144140. Is missing filter holders, and float switch, so is inoperable. Motor works fine. Contact me if you want the motor - firstname.lastname@example.org. No charge if you pay for shipping. I will include 2 filters, can include any other parts you want. Why the offer? Space in my house worth more than an inoperative appliance.
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.
Do you feel like looking at the humidifier yourself? You can open the door on the unit, while the furnace is running-- The humidifier is usually installed in the return air duct, so there will be a sucking of air into the open door, when you open it.
There is usually a large wheel, with a wet pad wrapped around the circumference. This wheel rotates slowly, and picks up water from the sump-- does everything look and sound quiet as it runs? -- The float valve has to open and close, to c ontrol the leve of water in the sump-- (The pool of water the wheel runs the mat thru-- Possibly the valve shutting off, could make a plumbing BANG-- you could duplicate that, by lifting the float mechanism and stopping the water-- does that make the noise?
If you can reach and operate the Humidistat control from near the humidifier, do so a few time-- or Have someone cycle the humidistat a few times, and you listen for that sound-- Is it in the humidifier itself, or the duct work nearby?
It might be that the humidistat wheel scrapes against the side of the sheet metal duct work? -- Sounds travel a long ways in metal duct work!
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.