Question about Holmes Products HM500-UC 1 Gallon Humidifier

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Wondering if damage to Holmes HM500 humidifier is fixable...?

Hi,I think I broke my humidifier by letting it run w/o water for too long...now when I turn it on, it makes a loud noise and no mist comes out. Is this fixable, and if so, what part should I need to get?
I really hope so. Thanks a lot.

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Unfortunately running the unit for too long will permanently ruin the unit. there isn't really a way to fix it. i do deeply apologize for that. so unfortunately you might have to replace the unit.

Posted on Aug 29, 2009

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1 Answer

Steam wets the hardwood floor or the carpet


The steam is condensing as it is expelled. The solution is to place a sheet of plastic underneath the unit to protect the surface

Jan 03, 2013 | Holmes Products HM500-UC 1 Gallon...

1 Answer

How do I clean my humidifier Holmes hm 500? I don't have the manual anymore. Thank you! Jaimee Murphy


If you are trying to descale it of all the mineral build up. The easiest way is to mix a 50/50 1 gallon solution of Distilled White Vinegar and Bottled Distilled Water and pour it in the empty tank. Allow it to sit for a couple of hours (Longer if it's really scaled) . Then turn it ON and run it, until the tank is half empty. Then empty the remaining solution and fill the tank with Bottled Distilled Water and run until it's empty. In the future, it's better to use Bottled Distilled Water, rather than tap water.

Hope this helped you and thanks for choosing FixYa.

Aug 26, 2011 | Holmes Products HM500-UC 1 Gallon...

1 Answer

What happens if the humidifier runs out of water? Humidifier is new and working fine. I Does the humidifier shut off automatically when it runs out of water?


The humidifier has a float valve in it much like a toilet tank does. If the water gets to low, the float valve should allow more water to enter the tank automatically. When it reaches the proper level, the float valve stops the water. The water line (either copper or plastic) coming into the humidifier should have a shutoff valve on it. Make sure that it is turned on.

Feb 02, 2011 | Holmes Products HM4600-U 11 Gallon...

1 Answer

Canister is filled with water...it's plugged in...it's turned on...NO STEAM


Thatis a safety feature designed to avoid overheating due to being empty.
You need to reset it.
Unplug it for a few minutes, and then set it to reset, after plugging it in. It should be working after a few minutes.

Jan 31, 2010 | Holmes Products HM500-UC 1 Gallon...

1 Answer

I have a brand new hm500 humidifier and when I turn it on I can see the mist being produced in the reservoir but it won?t come out the top. How do I correct this?


If you can see the mist, then, it is working. The outlet
port of your humidifier could be closed/stucked up/clogged. Please check this the outlet port.

Jan 06, 2010 | Holmes Products HM500-UC 1 Gallon...

1 Answer

No mist


i would try cleaning the coils for the heat portion. if they are to scally that could be one reason why it's not making any mist. but if it looks pretty clean or if you have cleaned it and it's still not making any mist then it's something internal. now if your under warranty still that's a good thing. you can always call the manufacturer and they can replace theunit for you under warranty . if you have any other questions please let me know.

Feb 26, 2009 | Holmes Products HM500-UC 1 Gallon...

2 Answers

No mist!


unfortunately on a cool mist unit the mist shouldn't show up. on most units that's what it does. the warm mist units show the mist.. the best way to tell is if you put your hand over the spout that the mist is suppose to come out of for about 2 minutes and you pull it away and it feel clammy then it's working. if your hand is still dry please let me know and i'll see what else i can do for you.

Feb 26, 2009 | Holmes Products HM500-UC 1 Gallon...

3 Answers

Holmes HM4600HD humidifier tank


Mine dried out too. I could not find where to get the rubber valve seal for the tanks. Holmes does not list the part and when I called the rep told me they didid not stock the part. I solved my problem by purchasing thin rubber washers from Lowe's. They are 3/16 X 1 1/4 X 1/16 thick. The 3/16 hole in the center "snaps" on over the end of the plastic plunger just like the original. I had to trim the outside diameter with scissors to about 1" or using the old ones as a guide. Cost me $0.67

Nov 09, 2008 | Holmes Products HM4600-U 11 Gallon...

2 Answers

Hm495tg


possibly calcium or other deposits from the type of water you are using in the unit..........

Feb 03, 2008 | Holmes Products Holmes 3 Gallon Cool Mist...

1 Answer

Will not reset


Per the operators manual you have to reset it. 1. Unplug the unit
2. Remove and refill the water tank, being sure to follow the Daily
Maintenance Instructions. Replace the tank onto the base.
3. Wait 5 minutes for the Automatic Shut-Off to reset.
4. After the 5 minutes, plug in the unit and turn the unit on to HIGH
(HI). The RESET light should now be off (if not repeat steps 1 through
3). In about 2-3 minutes, the humidifier will begin to produce
moisture.

Jan 03, 2008 | Holmes Products (048894556579) 4 Gallon...

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