Question about Aprilaire 550 Humidifier

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My Aprilaire new water pad has a white substance on it. I mentioned this because twice the pad (tworeleased a sticky, mucous substance that plugged the drain line and caused flooding in my basement. The intake water line is attached to the hot water line in the water heater. I have a Aprilaire humidifier, Model 560.

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Hello,All the pads have a protectant(white) coating because the pad is aluminum and would rot out fairly quickly from getting wet.The slime is bacteria(fungus) not from the coating that forms from stagnant (sitting) water.Make sure the unit is draining out dry after each cycle.With the pad out pour vinegar OR bleach & water (10:1) to kill the mold in the drain pipe.Do not clean the pad at all ,it gets replaced.They sell an inexpensive wet floor alarm at the store that makes noise when wet.

Posted on Oct 12, 2010

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Coating from water panel pad clogging furnace filter


I know of no answer to this except to remove the coating manually to prevent it clogging you filter.

Jun 22, 2017 | Aprilaire 600 Humidifier

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2 months into the heating season I noticed a large puddle around my heater. the Aprilaire 600 unit was leaking. The distrution tray had a red substance around the water holes. Also the overflow drain line...


Mold can really cause problems with humidifiers-
They do need to be serviced, cleaned up, and something like weak bleach used to kill mold spores, -- get it all tidy and clean!
Were you able to clean out the drain line?-- and is it draining now?
And is the float valve shutting off the water flow, before it reaches the overflow drain pipe?
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Tell us more--

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I've been working on the Aprilaire 110 unit today, after encountering the same problem. Here's how I fixed it: First, with the humidistat turned to 0%, I turned off the water supply saddle valve all the way (all the way to the right)--and then turned it back on all the way (all the way left). Still no water flow. Second, I slightly loosened the inline valve nut on the discharge side of the solenoid on the side of the 110 unit. Water began flowing, so I tightened it back up; and now the water flows freely. Conclusion: You may have some mineral deposit buildup in your lines, as I apparently did.

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