Should the water run on humidifier even when blower is off?


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Old 10-21-13, 04:21 PM
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Should the water run on humidifier even when blower is off?

My whole house humidifier runs constantly even when the blower is not on. Is this normal?
 
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Old 10-21-13, 04:44 PM
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I don't think so. It should only run when blower is on. If its running constantly, where is it going? Is it going through a drain into the floor or sump pit?
 
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Old 10-21-13, 04:57 PM
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It sounds like you have a malfunctioning or incorrectly wired control to your humidifier.
 
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Old 10-21-13, 06:21 PM
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Water goes to a drain. It seemed odd (and probably wasteful/expensive having the water running. I usually only turned it on when I went to sleep and turned it off when I woke up. Anyone have familiar wiring these things. I'll try to post some pics.
 
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Old 10-21-13, 07:34 PM
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Hi,

Does the humidifier operate when the power to the furnace is completely off? (light switch beside furnace or breaker) If yes, the solenoid valve is probably stuck open and needs to be replaced.

Otherwise...

Could you post the model number of your furnace and humidifier?

Trace the wire between the humidi-stat and furnace and tell us how it terminates in the furnace.

This should be an easy fix.
 
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Old 12-29-13, 07:08 AM
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I am having a similar issue. The humidifier is an American Standard HUMD300A. It was installed new in 2011 and worked fine. Last year it would run even with the blower off. The HVAC maintenance person told me it would run all the time due to a large house, even though I told him it did not the first year we used it. This year same thing, as expected, nothing was done last year. I have taken the solenoid off and cleaned the little filter per reading some diy forums. I have also read that if I disconnect one of the wires and the water stops running then it probably isn't the solenoid. Disconnecting the wire, the water stopped running. My question is it the solenoid and should I just replace it, or do I have other issues. Thanks in advance for your responses.
 
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Old 12-29-13, 08:29 AM
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Where is the humidistat located? Turning it to off should do the same as taking the wire off of the solenoid.
 
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Old 12-29-13, 09:01 AM
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I can definitely shut it off at the humidistat, it is located in the great room above the thermostat. I sometimes forget to shut it off and it runs all the time until I shut it off again. I had read that if you can disconnect the wire at the solenoid and the water stops then it probably is something other than the solenoid. I have also read that replacing the solenoid might work.
 
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Old 12-29-13, 09:31 AM
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Not a solenoid problem then. The question is what has changed in the way it was originally wired and worked fine. If the power to it is rated at 24volts, it could be wired into the white and common on the board and would only run on a call for heat. I'd say you need to trace the source of the power back to the furnace.
 
 

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