Question about Slant Fin Warm Mist GF-350 Humidifier

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Clean/refill light My humidifier lights "Clean/Refill", even though it´s full. Don´t have a manual any more. How do I clean it?

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  • matsuzie Dec 15, 2007

    Same problem; clean everything multiple time, replaced bulb, refill/clean light stays on. Does the water probles cause this? Can they be replaced?

  • eliasw26 Jan 18, 2008

    cleaned and refilled when I turn past a certain point it comes on how do I stop this

  • fjshow Mar 20, 2008

    I've cleaned it multiple times and still the clean/refill light stays on. I also have lost my manual. Anyone know where I can get a manual or have any idea how to resolve this problem? This piece of x$%@@ is unusable!!

  • Anonymous Mar 31, 2008

    How do you clean it? I can't get the brown **** off the bowl, and I think the tube is pretty clogged.



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My Slant Fin humidifier has a floating, ring-shaped magnetic level that isn't replaceable. You can't even tell it's magnetic until you cut off the piece that prevents the white plastic float from rising past a certain point. It turns out that there is a ring-shaped magnet in the float.

I found that the Refill light would go off when I held a strong magnet near the float device.

So, I have suspended the magnet with string from the top of the humidifier outside the humidifier.

Caution: This fix disables the safety feature inherent in the low level shut off. I wonder why the manufacturer uses material that corrodes?

Posted on Oct 27, 2008


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It runs but does not put out any mist.

You didn't specify the brand or model, but for generic advice, try using a strong solution of white vinegar and water and soak overnight or for several days (if very scaled up).

If you were using hard water in the humidifier, try using a commercial humidifier cleaner such as BestAir products (or similar - there are many to choose from): Amazon com BestAir 3US 6 UltraTreat Ultrasonic Vaporizer Water Scale...
(Make certain it's certified for steam and/or ultrasonic use, if your using that type of humidifier).
Follow directions on box. You will have to let soak for a period of time (hours/days) to allow chemicals to do their thing.

If you are using "soft" conditioned water, just refill with soft water and allow to sit for several hours, then discard and refill. The hardened minerals will re-disolve and will be removed when you flush the unit. For hardened minerals clinging to the sides, etc, just use your fingers to break up, possibly a brush or Dolby pad and break them loose.

(Soft water has just as much minerals as hard water, but in hard water there are mostly calcium based and turn rock hard and in soft water they are sodium based (sodium bicarbonate actually) and have a weak structure).

It's important to keep a humidifier clean of deposits, not just to keep the unit running, but to avoid air quality problems (bacteria will cling to scale buildup, which make excellent breeding grounds for them).

If you use "hard" tap water, clean (at a minimum) once a week. Use white vinegar and water - 50/50 mix. If your using "soft" conditioned water, clean once a month. Same with distilled water.
You could also consider using a small amount of bactericide in the water to prevent bacteria from growing. (Okay for filter type humidifiers, but DO NOT use in ultrasonic or vaporizer type humidifiers). 1/4 cap full should suffice. BestAir 3BT 6 Original BT Humidifier Bacteriostatic Water Treatment 32 oz

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1 Answer

Water refill light prevents unit from working. Tank is filled . Unit has been cleaned

Your problem is most likely a damaged Ultrasonic Disk (sensor).

If your product has not been used for a while, this piece was most likely damaged if it wasn't properly cleaned before storing. Cleaning well sometimes isn't even enough for this sensitive unit.
Unfortunately, there is no way to get this part, even though it is easily removed and could be easily replaced. Bad PR on the manufacturer's part. Your only solution is to send it for repair (if under warranty, you just pay shipping, if not, you pay shipping and $30) or to buy a different brand. You would think for as expensive as these machines are, the manufacturer would have a better solution to this extremely common problem.

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Before I returned it I would clean it thourghly and refill with clean water and about 1/4 teaspoon of table salt. Run it thru a full cycle and see if that helps. You can also rinse it out and refill with a 1/2 cup of vinagar and run again.This shoul help loosen and clean any mineral deposits. Hope this helps. Thank you.

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Have a warm air Honeywell humidifier. The "refill/restart" button is permanently on even if I refill the humidifier and the humidifier does not want to work now. How do I fix this? It seems a sensor is...

This may be due to one of two things.

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.

I just uploaded a copy of the user manual to this site, but if you would like to download it directly, follow this link:

Hope this helps!


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The power light on my Bemis 4D-7800 humidifier flashes.

On my water wheel several parameters must be met. 1. Power on, cord plugged in. 2. Water in tank, the float arm needs to move to indicate water present, the red light on the dash indicates no water. 3. Humidity controll set higher than the room atmosphere humidity, clockwise is higher on mine. 4. The fan speed selecter must be on either high or low, the fan won't run unless one position is selected. I hope this helps

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Refill light is on, but the water tank is full

In the manual it says that you should clean the heating element. Unplug the machine, lift off the water tank, pull the lever under the tank and lift off the power unit side. If there is too much build up on the element from mineral deposits, the refill light may remain on.
Unfortunately, I have cleaned mine, soaked it in vinegar, made it look nice and new...and it still doesn't work. I am really annoyed as I have not had this humidifier long and have taken really good care of it. I do not want to throw it out. I am going to call customer support and find out if there are any other solutions. (I got a new one for Christmas and do not want to open it until I am sure that it is not fixable!)

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