Question about Honeywell HCM-646 4 Gallon Humidifier

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Honeywell HCM-646 -Motor not running

Honeywell HCM-646 - 3 years old. Took out of the box this winter and plugged in. Lights come on but moter is not running when I turn power on. Playing with humistat setting doesn't help (unit not running when humistat is off even). Is there a fuse or something or is my motor bad? Something else? Thanks

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  • Master
  • 665 Answers

There is normally a capacitor to prevent surges across the motor it might the short circuit.# and preventing the motor from starting.

Posted on Jan 13, 2018

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6 Suggested Answers

6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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Joe_Rex
  • 114 Answers

SOURCE: motor turning real slow

THE MOTOR ONLY TURNS THE SPONGE DRUM AT MAYBE 10X'S PER MINUTE. THIS IS A BY-PASS TYPE HUMIDIFIER THAT RELIES ON YOU FURNACE BLOWER MOTOR TO SUPPLY AIR ACCROSS THE SPONGE MEDIA. NOTICE THE 5"-7" ROUND HOLE MUST BE DUCTED TO THE PLENUM OR RETURN AIR. (IF MOUNTED ON THE PLENUM, THE HOLE HAS TO BE DUCTED TO THE RETURN AIR, AND VISA-VERSA.) CAUTION!!!IF YOU HAVE CENTRAL AIR? A "DAMPER" MUST BE INSTALLED AND KEPT CLOSED THROUGH-OUT THE "COOLING SEASON". SERIOUS DAMAGE TO YOUR COMPRESSOR CAN RESULT FROM TOO COLD OF AIR ... CIRCULATING AND "BY-PASSING YOUR EVAPORATOR COIL".

Posted on Apr 27, 2007

maklean
  • 1665 Answers

SOURCE: Honeywell HCM 560 Cool Mist Humidifer

Hi have a look at this:
http://www.appliancefactoryparts.com/content/pdfs/111854.pdf

Posted on Jan 20, 2008

  • 1 Answer

SOURCE: where is on/off switch HCM-305T-CST

There is a 0 setting on the fan speed setting knob ...

Posted on Jan 05, 2009

  • 114 Answers

SOURCE: tank is broken on Honeywell HCM-560 humidifier.

you type in on the internet. www.appliancefactory.com
in the search bar type in your model number. it might take a minute to load but you will have 3 pictures that come up. click on any of them and scroll down alittle until you see water tanks. you can order them there.. or if youdon't want to go that route you can always try local hardware stores to see if they have it as well.

Posted on Aug 21, 2009

  • 2 Answers

SOURCE: Our HCM-640bw Honeywell humidifier will leak water

Found a hairline crack in the water canister. Had to locate by filling the canister and waiting for a couple of minutes for water droplets to form outside the canister. This ever so slight crack allowed air to enter the chamber and made changes to water dispensing rate which overfilled the resevoir over time ( hours). The cracks were not visible under 10X magnification without the water droplets.

Posted on Jan 20, 2010

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1 Answer

Honeywell quietcare humidifier won't turn on


I am surprised that this answer isn't found anywhere, including in the manual from Kaz. If yours is the same version as mine, and your lights aren't even lighting up on top, most likely your float may have gotten bound up with gunk (the float rises up when the pan is full enough of water, which enables the motor to run. It is held into place by a plastic bracket with two phillips head screws, and looks a bit like a plastic bottle with a narrow neck in a small rectangular shape (not open at top). Remove the screws and the bracket, and take out the float and clean it and the reservoir (in the base) it sits in. Reinstall, and the float should move freely. Problem solved!

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Save the time and frustration these units are hard to work on. Make sure there is power to the unit other than that throw it away and buy a new one for $100.

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Our HCM-640bw Honeywell humidifier will leak water onto the floor. If I fill the tank and let it sit without turning it on, no leaking. When it runs for about two hours it leaks bad. Any ideas on how to...


Found a hairline crack in the water canister. Had to locate by filling the canister and waiting for a couple of minutes for water droplets to form outside the canister. This ever so slight crack allowed air to enter the chamber and made changes to water dispensing rate which overfilled the resevoir over time ( hours). The cracks were not visible under 10X magnification without the water droplets.

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Tank is broken on Honeywell HCM-560 humidifier.


you type in on the internet. www.appliancefactory.com
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Unplug the machine and take both the water jugs off. Take the motor unit off and flip it over. Plug it into an outlet and press down the small silver contact at the bottom of the motor. When you press this down, a connection is made and the motor should turn on (Don't worry about being electrocuted, this is perfectly safe). If the motor turns on and runs at various fan speeds, you know it's not an issue with the main unit.

When looking at the base, on the left side you'll notice a plastic piece sticking up that's held down with a plastic shroud and 2 screws. This is you water level sensor. When the water level raises up, this also rises and hits the silver contact on the bottom of the motor. Make sure this isn't binding up(I suggest you clean it) I had the same issue with my HMC-6012i, lights were on at the indicated humidity level but the motor would never run. Take the unit apart, clean it out and follow my instructions. It should fire up (Mine is running right now :) )

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Where is on/off switch HCM-305T-CST


There is a 0 setting on the fan speed setting knob ...

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Look for a microscopic crack in the water chamber. Leaking air will allow the water to continue to drain out of the tank. A bit of glue and duct tape over the crack should fix it.

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