Question about Slant Fin GF-210W 2 Gallon Humidifier

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Humidifier doesn't work as it used to,,,,,

My humidifier doesn't work as it used to before, i mean it sounds like it's working but it doesn't humidify almost at all. The refill/reset light comes on and off, even though the tank is filled with water, i tried to unplug it and then switch back on, but nothing helps, Please anybody knows what is going on? I bought it like 5 months ago so it's still new.

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Re: Humidifier doesn't work as it used to,,,,,

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 This particular thermostat is obsolete and very difficult to find.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.

Posted on Dec 30, 2007

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Re: Humidifier doesn't work as it used to,,,,,

Use vinegar to clean the unit.  fill the two reservoirs with vinegar, let it sit for 30 mins.  use wire brush on the sensors if the minerals are caked.  change the absorption pads more often - easier than cleaning.

Posted on Nov 20, 2008

Re: Humidifier doesn't work as it used to,,,,,

The solution did not mention what to clean the humidifier with.

Posted on Oct 24, 2008

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SOURCE: the water refill icon keeps blinking, but the humidifier is full

have you checked the water sensor?

Posted on Dec 13, 2007

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SOURCE: Have a warm air Honeywell humidifier. The

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!


Posted on Jan 20, 2011

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