Question about Slant Fin GF-210W 2 Gallon Humidifier

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Humidifier's reset light flashes on and off


My Slantfin GF210W humifier's "reset" light flashes on and then moments later turns off, on, off, on, off... I don't know what's wrong with the unit.

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Re: Humidifier's reset light flashes on and off

Most likely it is the water sensing transistor (C1815) in the unit. This can be replaced but it would have to be by someone who knows how to repair electronic instruments. The cross for the C1815 transistor is NTE85 and sells for about $1.50.

Posted on Dec 27, 2007

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After cleaning everything the humidifier no longer runs. When I turn it on no matter what level I set the desired humidity to the green light goes on indicating that it is at the desired humidity. Before...

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HI, Troubleshooting an Aprilaire Humidifier

Aprilaire, a manufacturer of indoor air quality products including thermostats, air cleaners and dehumidifiers, also offers a line of whole house humidifiers. Installed in your existing heating and cooling system, humidity is produced by a supplied water source that flows over a water panel before being distributed throughout your air through the heating and cooling system. Issues you may need to troubleshoot with your Aprilaire humidifier include error messages and the unit producing too little or too much humidity.

Things You'll Need:

Replacement water panel

Turn down the control dial by one setting if condensation appears on your windows or walls.

Turn up the control dial by one setting if there is a lack of humidity, often indicated by dry skin or peeling wallpaper or paint.

Turn the control dial to "Test/Reset" if the humidifier does not run. Verify the heating and air conditioning unit blower is operating. If the heating and air conditioning unit is not operating or you are unable to resolve the issue contact a heating contractor.

Contact a heating contractor if you turn the control dial to "Off" and the humidifier continues to run.

Contact your Aprilaire dealer (see Resources) if you notice an error code on the display and the "Call Dealer for Service" light flashes.

Turn the control dial to "Off" and turn off the water supply if the yellow "Change Water Panel" light flashes. Lift the front panel off of the humidifier. Slide out the water panel. Insert a new water panel. Replace the front cover. Turn the control dial to "Test/Reset" until the "Humidifier On" light flashes. If you feel uncomfortable changing the water panel, contact a heating contractor.

Tips & Warnings

Purchase replacement water panels through your Aprilaire dealer or a heating contractor.

You can get parts from the link below:

Hope it helps.

Thanks for using fixya....

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1 Answer

I replaced the water panel on our aprilaire 600 humidifier. I adjusted the thermostat to call for heat to test it. When the dial (non-digital control panel for the humidifier) is turned to test/reset,...

Thank you for contacting us with regards to your model 600 Humidifier. The Change Water Panel indicator should flash when the control knob is set to the Test/Reset mode. The flashing indicates that the timer has been successfully reset. However, the humidifier should operate for the first 60 seconds of Test mode as long as your furnace is running. If your humidifier does not turn on, contact your installer. The humidifier may require service.
We appreciate the opportunity to be of assistance.

Brett Phillips
Technical Support
Research Products Corporation

Nov 01, 2010 | Aprilaire 600 Humidifier

1 Answer

How do you set and or reset the "filter replacement"schedule on the April air #700 model?

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Hope you find this to be very helpful.

Let me know if you have any questions. :-)

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House is dry though it's quite cold outside and furnace is running. Aprilaire is turned up to 35 (I have a dial, not a digital panel). the water panel is completely dry (should it be?)

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Slant/Fin has sold the humidifier and PC-55 air purifier business to KAZ USA Inc. If you need replacement parts, repairs, or have any questions regarding the products, please contact them at: KAZ, Consumer Relations Dept. 250 Turnpike rd., Southborough, MA 01772 Phone: 800-477-0457 email: also worth a look is: seems to be best forum for humidifier stuff

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