Question about Swiss AIR-O-SWISS Ultrasonic Humidifier - Model AOS 7135 Humidifier

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Air o swiss 7135

Worked fine last winter. This year I fill up the tank and place it on unit.
As soon as the base fills with water, the remainder leaks out. The tank will not leak until it is turner over and placed on unit.

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Re: air o swiss 7135

Sounds like the filter is not allowing air flow.

Posted on Feb 14, 2008

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Flashing red flight

Its probably the cleaning light that comes on periodically to remind you to clean the unit. Shut off the unit AND when you do so hold down the power button for several seconds until the flashing red light shuts off. The cleaning light should stay off until the next cleaning is due.

Per the Air-O-Swiss FAQ:

Q: Cleaning light is flashing (AOS U650, AOS 7135, AOS 7142, AOS 7144, AOS 7147)
A: Switch the unit OFF and unplug it. Empty the water in the base. Rinse the base with hot/clean water. Do not submerge the base! Visually inspect the base for dirt or mineral build up. If soft water is used decalcifying the unit every 4 weeks with EZ Cal is suggested. If hard water is used the unit should be decalcified every 2 weeks. Do not forget to reset the clean light after resetting the unit.

Q: Reset cleaning light (AOS U650, AOS 7135, AOS 7142, AOS 7144, AOS 7147)
A: The cleaning light does not automatically reset. Hold down the power button (button A in instruction manual) until the light stops flashing. The light automatically comes on approximately 14 days after plugging in the unit.

Feb 15, 2014 | Air-O-Swiss U7142 Humidifier

1 Answer


These hints are from the air o swiss webpage.
Q: No mist / unit is not working / empty indicator keeps flashing
A: Fill up the water tank. Check if water is flowing through the demineralization cartridge (attached to the water tank cap). If the water tank is full but there is only little water in the base it indicates that the water is now flowing through the demineralization cartridge.

  • Wait for 15 minutes to allow the mist to come out of the unit.
  • If the unit is not working and the empty light is not flashing you might have set the desired humidity too low and the current humidity level in the room is higher. That is why the unit switches off automatically.
  • If the empty indicator continues flashing and the tank is full, water is not flowing through the cartridge. Exchange the cartridge or the granules in the cartridge after 2-3 months, in areas with hard water exchange the cartridge after 1 -2 months. However, the demineralization cartridge and or the granules must be exchanged at the latest after 6 months or the unit does not reach its full performance.
If the granules are new, see the following instructions:

  • Make sure the cartridge and/or granules were soaked for 24 hours, water takes longer to filter through dry granules in cartridge and into the base. Next, remove 2 tablespoons of granules from the cartridge, and throw them away. Too many granules in the cartridge it does not allow water to flow from the tank to the base.
If your issue is with the float and not the mister, then you have to make sure the float is tripping the micro switch that turns the machine on. Some units the filter will not allow the float to hit the switch if the filter is not installed correctly. If everything is in correctly and the float is tripping the switch, then the micro switch must be faulty.

Apr 04, 2011 | Swiss AIR-O-SWISS Ultrasonic Humidifier -...

1 Answer

Where does the silver ion stick go into the unit AOS 7135

In the base on the side opposite of the membrane - see pg 13 of the manual for a picture showing where it belongs.

Oct 10, 2010 | Air-O-Swiss AOS 7135 Humidifier

2 Answers

How to clean air-o-swiss humidifier?

Gererally according to the booklet in the box.
If you no longer have those instructions, simply clean out the
basin, make sure no mold, dust, hardwater or calcium is deposited.
Use a 10% bleach water solution to kill bacteria, and thats is basically it.
Just dont miss any spots, but humdifiers should be cleaned every few uses.

Feb 19, 2010 | Air-O-Swiss 7133 Humidifier

2 Answers

No instruction manual

1. Before filling the water tanks, push the POWER switch to the “OFF” position and
unplug unit. Refer to cleaning instructions.
2. Remove water tanks from base, turn each tank upside down and remove tank cap
by turning counterclockwise. Fill tank with clean cold tap water.
Replace the tank cap by turning clockwise. Tighten firmly.
3. Carefully pick up tank, since it will be heavy when full, and slippery if wet.
4. Place water tanks on base. Make sure tanks are properly placed, otherwise, the
humidifier will not work correctly.

Feb 11, 2009 | Slant Fin Cool Mist GF-220 Humidifier

5 Answers

Air-o-swiss 7135 humidifier not misting

Ours has done the same thing after only 2 weeks. From article research, it appears that this occurs to everyone after cleaning it with the EZ Cal that is recommended. From looking at our unit and figuring out how it works, it appears as though the Ultrasonic Vibration membrane has stopped working. This particular piece is responsible for vibrating the water and making water mist particles which are blown out with the air. We will be calling the manufacturer on Monday to register a complaint and request a replacement unit.

Nov 23, 2008 | Air-O-Swiss 7133 Humidifier

1 Answer

Air-o-swiss 7142 humidifier

I just cleaned mine for the first time, and the instructions are very unclear in the pamphlet on how to do it.
What you need:
One package of EZ Cal cleaner/descaler for humidifiers ( I got mine at bed bath and beyond)
32 oz of hot water
How to clean your unit:
Mix the hot water with the EZ Cal cleaner packet in a separate container.
Remove the tank from the base.
Remove the cleaning brush and the silver stick that is in the base of the unit.
Pour the solution in the base of the unit.
Let the solution sit in the base of the unit for 1/2 hour.
Then take the cleaning brush, and go over the surfaces in the base.
Pour out the solution, and rinse with hot water.
Put the brush and silver stick back into the base.
Put tank back onto the base.
Reset the unit by pushing and holding the power button for a few seconds.
This will stop the cleaning indicator from blinking.
Let the water fill up the filter for a couple minutes, turn on, and your ready to go again.
I hope this was helpful.

Nov 03, 2008 | Air-O-Swiss U7142 Humidifier

4 Answers


Try to just fill the tank with water and set it upright on a table. If it leaks, the tank is cracked and needs to be replaced. Order one at (search using model#). I have had this tank leak if the special cap is not sitting properly on the base. Make sure that the steam tower is properly locked in place before you place the water tank in the reservoir. The cap on the tank has a spring release that has to be correctly lined up so it only releases water when the water level in the reservoir drops.

May 08, 2008 | Vicks Warm Mist V745A 1 Gallon Humidifier

1 Answer

Red droplet light stays on

I had the same problem. I replaced the filter and cleaned the base and then it worked.

Jan 10, 2008 | Swiss AIR-O-SWISS Ultrasonic Humidifier -...

1 Answer

Fan is running but humidity is not changing

Q: My unit has been running for several hours. I hear the fan spinning, but I do not notice the water level in the tank decreasing.
First, check the filter to ensure it is wet. If the pad appears dry, remove it from the Base and gently rinse under cool water. Reposition wet filter in the Base. You may also want to note the current moisture level in your home. If the humidity level is over 60% the unit will not put out much moisture
as your air is already saturated.

UV bulb and filter are user replacement items

see manual from my other post
Owners manual LINK
Comment by Soulvisitor, posted on Jan 20, 2008 You should notice moisture on the widows in the room after unit has run for awile, this unit carries a 3 year warranty. More info coming...
Comment by Soulvisitor, posted on Jan 20, 2008 see this
4b54ac1.jpg Comment by Soulvisitor, posted on Jan 20, 2008 If water level in tank is dropping and fan runs then I'd say it is working.

Comment by Soulvisitor, posted on Jan 20, 2008 Q: I hear the fan turning, but I don’t see any mist. Is my humidifier operating properly?
Dry air is pulled through the system and a fan disperses invisible, moisture balanced air. There is no
“mist” emitted. When operating normally you will feel only cool air coming from the unit. Monitor the
water level in your Tank/ Base. If you notice a decrease in the Water Tank over 24 hours then the unit
is operating normally.

Dec 02, 2007 | Honeywell HCM-300T Humidifier

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