Question about Aprilaire 550 Humidifier

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Continuous water flowing

The water runs through the april air when the heating unit is either on or off. Help

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  • ausable Dec 28, 2008

    At first wasn't getting any water through the valve, now it free flows through. I here a click that should indicate that the valve is working, but the water continues to flow. Can the valve be serviced or cleaned?

  • Anonymous Jan 02, 2009

    Water runs continuously unless the humidity level is lowered on the controller.

  • bradnamy Jan 26, 2009

    when my humidifier turns on it runs continuasly. it is not a slow trickle . it is overflowing and leaking out of the bottom tray.when i turn the humidistat on i can here a click and you can feel the solinoid energize.the water does not always start running right away is that normal? i replaced the shut off and filter .water lines and drain lines are all clear. could this be a bad humidistat?

  • Gene Horn
    Gene Horn Feb 24, 2009

    I have two very similar but not necessarily the same problems.

    On one unit, water flows through the solenoid water valve when ever I turn the humidistat knob above a certain level, whether or not the furnace is running. Any suggestiions?

    On a second unit, the solenoid vater valve opens when the furnace runs, assuming the humidistat is set high enough, but does not shut off when the furnace stops. Is this a stuck solenoid water value which should be replaced?

    Thank you.

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  • 88 Answers

Thanks for your questions,
what you will want do first, disconnect one lead off of your Humidistat, or at the Solenoid, to see if that stops the water, if it does, you will need a new Humidistat, if not, then you have a bad Solenoid, that will need replaced, you should be able to purchase one or both of these either online, or through an appliance store, or your local Heating and A/C shop, hope that helped ya, let us know how we did, thanks again,
mr.grzz

Posted on Jan 21, 2009

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1 Answer

Humidifier Running Continuously with Fan Blower


As long as the humidifier start/stop is regulated by air flow there is no way to cycle it on/off with another device. If, however you disconnect that capability and, instead wire it to the heat on cool on switch it will only turn on when the stat calls for heating or cooling. You may need to install an intermediate relay off the stat wires to regulate the different(assuming that they are) voltage of the humidifier start/stop.What a fun project, thanks!

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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:

arnoldservice.com/humidifier_parts.htm


Hope it helps.

Thanks for using fixya....

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Here is an overview of how the dehumidifier is supposed to work:

When the unit runs, the circulating fan and compressor also run. The fan continually draws room air over the evaporator coils, which are cold, and then over the condenser coils, which are warm. Because the evaporator coils are cold, the moisture in the room collects on them--just as the outside of a glass of icy liquid "sweats" on a warm, humid day. When the moisture on the coils increases, it drips off of the coils into the collection container.

The air then flows over the warm condenser coils and out into the room. This process removes water from the air and, because of the heat from the fan motor and compressor motor, the exiting air is somewhat warmer, as well as dryer.

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