Question about Aprilaire 700 Humidifier

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Aprilaire 760 Humidifier water continues to run

After the furnace blower shut down the water continues to run through the humidifier. Do I replace the solenoid valve or is there another solution?

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  • sheff528 Jan 24, 2009

    We just moved into this house, and it had the Aprilaire 760 installed, but disconnected. When I put it back together and turned the water on, the water kicks on when the furnace is off and the humidstat is turned up. When the furnace comes back on, the water cuts off. It's clearly wired backwards, but I can't figure out what's wrong.



    There is a 24V transformer near the humidstat, and one of the feeds runs through it. It has constant power being fed to it. The plug for the humidifier is plugged in to an outlet on the furnace that only has power when the furnace is running. The brown wires coming off the humidifier are wired to the humidstat (one of which has the 24V feed).



    Hopefully that gives enough detail to help.



    Thanks!

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You need to determine whether the problem is in the solenoid or in the furnace electronics. You could put a voltmeter on the solenoid connection to see if the furnace is still holding the solenoid open after the blower stops. This will tell you whether it is the solenoid or not.

Posted on Feb 19, 2007

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