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I have an aprilaire 568 bypass humidifier. (no fan). The problem I'm seeing is that the water 'valve' is oscillating open/closed. I suspect this is due to a humidity sensor or thermostat going bad. Which should I target for replacement first? (OK it has been cold for the month of Jan - below freezing all month, so I expect the thermostat ). Is there a way of checking this before just replacing it?

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If its opening and closing it sounds to me like a loose wire nut on your 24volts to your water solenoid valve. The only time that the humidifier should come on is in heating mode and then when the furnace gets up to temp and the blower starts. If furnace is older it will have a current sensing relay located in the blower compartment with a plastic box and two wires coming off of it.One of the blower wires( generally RED for low speed) should be going through that sensing relay.If you have some slack in that blower wire try wrapping it around that sensing relay a few times. I would chek all my wire nuts first though before you do the sensing relay. David

Posted on Feb 01, 2009

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Where can I get part #4087 float assembly for Aprilaire humidifier model445?


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I wasn\'t willing to buy a whole new humidifier, so if you\'re willing to do a little more work, you can do what I did. I substituted a Kerick MA252 Mini PVC float valve. This isn\'t a direct replacement, the float and float arm that come with it are a little too long to fit. You take off the float and float arm and use the original float and float arm. The bolt on the new valve is too big, so you need to provide a bolt that won\'t rust (brass, stainless, teflon, etc.) to connect it. You\'ll have to play with the position of the float arm to set the proper water level. You\'ll also need the square plate off the original float valve to provide a flat mounting surface for the new float valve. You\'ll need to ream out the hole in the plate and the mounting hole to make them round. The tubing inlet on the MA252 works great, but you\'ll have to enlarge the opening on the cover to accommodate the tubing inlet.



The MA252 is made of PVC and stainless steel, so it shouldn\'t corrode away the way the OEM valve did. And better yet, the MA252 costs less than $10 (I got mine on Amazon) where the OEM valve would have cost more than $50 if you could get one.

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If this post was helpful please let me know.

Thank you for using FixYa!

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robhvac47_0.jpgSail switch

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2 Answers

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Remember to turn of electrical power to unit, furnace, air handler if a split unit, and don't attempt anything your not exceeding your experience level.
Vote for Patrick Mot, Thanks

http://www.aprilaire.com/themes/aa/en/manuals/AA-Humidifier-Owners.pdf

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