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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.
Change the filter then unplug the unit from the electrical outlet and the code will be cleared. Just shutting the humidifier off won't clear the code, it has to be unplugged from the power to clear the flashing CF.
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.
1. If you turn the unit off or unplug it when you refill the resevoir, then plugging back in or turning it back on will not automatically reset the refill sensor. You must depress the restart slide switch on the bottom front controls to reset and restart the unit, or.....
2. It the refill light won't clear after refilling the resevoir or following the above step, the most likely cause of the problem is a scaled up heating element, which must then be cleaned.
First check to see if the two water sensing probes have been cleaned.After cleaning, if the problem still persists, try the following.
There is a small thermostat switch that sits on the heating coil underneath.This thermostat is designed to prevent the coil from overheating when no water is present.What probably has happened is the switch is doing what is designed to do but has become defective and is opening and closing at a lower temperature.So what is happening is the red light reset indicator will come on because this switch opens, the coil starts to cool and the switch closes and the light goes off.Because it is defective, this is occurring when it shouldn’t, causing this maddening on/off cycle.
Fortunately, this sensor is easy to replace if you’re handy.Make sure you unplug the humidifier from power.Turn it over, remove six screws, and carefully lift the lid.Look toward the heating element and you will see a small button type device with two wires plugged into it and is attached with two screws off to the side of the element.This particular thermostat is obsolete and very difficult to find.However, there is an excellent substitute made by Stancor for around $5.00.Their part number is STO-325.
Remove the two screws and lift off the thermostat and slide the wire connectors off.Simply reverse the process for installation and be careful to replace the bottom lid, being careful not to crimp the wiring.