Question about Air-O-Swiss U7142 Humidifier

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Flashing red flight

Filter is new and there is water

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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.

Posted on May 17, 2014

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Posted on Jan 02, 2017

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Looking for filter for windchaser HUL60...it's been discontin


You are right, all of the sources I know, including eBay, are out of stock. Can you get buy without the filter by usng filtered water from your fridge or buying distiller water by the gallon At the grocery store? Use some tape or glue to hold down any sensor that checks if the filter is in place.

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WATER LEVEL FLOAT DEVICE PREVENTS UNIT FROM TURNING ON,EVEN THOUGH WATER TANK IS FULL. REMOVED SOME FILTER MATERIAL WITH NO EFFECT. FLOAT IS FREE WITH NO RESTRICTION.


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.

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1 Answer

My Slant/Fin GF 350 suddenly will not heat the water and has the "fill/clean" red light on even though it is clean and has a new filter in it. there are no mineral deposits in the well, and no...


the rusted sensors are the cause of your problem - as soon as the sensors do not conduct an electric current through the water (either because there is no water or because they have decayed), the humidifier shuts itself off. You will need to replace the sensors. var viewReq = new Array();function vu(u) {var i=new Image();i.src=u.replace("&","&");viewReq.push(i);} vu("http://googleads.g.doubleclick.net/pagead/adview?ai\x3dB3Oe4m7gKTa-UBNCi6Qbh1uhIjbTQzgH1yJ29FJ2PiKQXABABGAEgADgBUIDH4cQEYMn-vYzYpOARggEXY2EtcHViLTMzODQ5NDYyODUzNTE5NTayAQ13d3cuZml4eWEuY29tugEKMzAweDI1MF9hc8gBCdoBTWh0dHA6Ly93d3cuZml4eWEuY29tL3N1cHBvcnQvdDY2NzU2OTctc2xhbnRfZmluX2dmXzM1MF9zdWRkZW5seV93aWxsX25vdF9oZWF0mAKsG8ACBMgCtZzVEeACAOoCIzYxNTMvZml4LmhvbWVnYXJkZW4vaGVhdGluZ19jb29saW5nqAMB6AO8BugDgQn1AwIAAATgBAE\x26sigh\x3dDErSUArfSlA") body { background: #FFFFFF; margin: 0px; padding: 4px; font-family: arial, verdana, sans-serif; font-size: 10pt; } p { margin:0px; padding:0px; } .spwrap { background: transparent url(/wysiwyg_rte/misspell.gif) repeat-x scroll center bottom; }

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1 Answer

I only used my machine for just about two weeks (only in the evenings)with a brand new filter and already the top of the filter has turned yellow/brown and brittle. Is it normal to go through a filter so...


how long the filter will last depends on your water .. if your water has a high mineral content then that is left behind as the water evaporates from the filter/wick ... the yellow brown sounds like calcium deposits .. calcium is often added to water to give it a good taste .. that may be beneficial for you but will build up on the filter .. it doesn't hurt much until it starts to clog the voids in the filter material .. as long as air gets thru then the deposits will be ok .. normally the filter should last about 3 months .. if you use distilled water (with no calcium added) then much longer .. if you have hard water then less .. there is a tablet that you can add to the water to reduce the calcium buildup .. the manufacturer of your humidifier will likely recommend that .. thats often available from hardware stores also ..

so your choices are:
1. don't worry about it until the filter becomes clogged
2. use the anti calcium tablet or something like ProTec PC-1 Humidifier Tank Cleaning Cartridge
3. use distilled water for really long filter life
4. plan on replacing the filter every 3 months

other types of humidifiers have other problems .. the hot water type gets calcium deposits on the heating element requiring cleaning a couple times a year, usually with vinegar or a calcium solvent .. that takes awhile..

the Ultrasonic type doesn't generally have problems with internal deposits because it blows moist air out including the calcium .. that produces a fine dust on surfaces in your house ..

of those types the filter system like yours is easier to maintain than the hot water type and doesn't leave dust behind like the ultrasonic all work better and longer if the water is pure .. distilled water doesn't cost much but you have to be careful .. read the small print .. some of it will say "calcium added" .. you don't want that .. if you use only distilled water then the filter should last the whole year ..

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1 Answer

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Humidifiers that evaporate the water in a filter wick, or with heat, do not generate dust because the water evaporates inside the unit and the calcium is trapped inside.

You can avoid the dust problem with your humidifier by using distilled water. Distilled water is available in most stores that sell bottled water in gallons...but be sure to choose "distilled" water, not "purified" water. Try the distilled water in your steam iron also...if you have one. It will last longer.

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How long are you going between filter changes?

A filter that stops wicking water up and turns orange/yellow is one full of deposits.

It sounds like you have hard water. How are you filtering this water before you use it? Distilled water is the best.

Replace the filter. They don't last forever. Mine normally last a month to a month and a half.

Good Luck

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Water leak


your drain pipe is clogged up, going to drain- Duh

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