Question about Aprilaire 600 Humidifier

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No water running through my humidifier

When my furnace turns on the humidifier does not. i changed the solenoid but still wont open to allow water to run through

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  • whozyerdanny Jan 04, 2009

    it is a honeywell he220a

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Is it getting 24 volts? sounds like its not being told to open. check for voltage at the two wires going to the solenoid.

Posted on Jan 05, 2009

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Aprilaire 700 never shuts off


Thanks for your question,
Sounds to me like you have a bad solenoid valve in your Humidifier, this will need replaced, the solenoid is supposed to open and close when there is a call for humidity only when the furnace is running, then when the proper amount of humidity is sensed by the humidistat, then will it shut off, with the solenoid not working it will let water flow through like an open faucet, the solenoid is the componet that the 1/4in copper tubing connects to at the humidifier, has two wires running from it, you will need to shut the power off before changing this out, also shut the water off at the valve at the other end of the 1/4in copper line, or you might get soaked,please be careful when installing the new solenoid, making sure the water line connection is secure, or you will have leaks, hope this was helpful, please leave a rating, thanks again for your question,
mr.grzz

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Humidifier control .


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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.

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