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Old 01-23-2013, 02:50 PM   #1
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Humidifier keeps running water even when furnace off


Hey Guys, my humidifier keeps running water even when the furnace turns off
water keeps going through the soilniod valve and keeps running.
i thought it was a faulty soilnoid valve so i replaced it and no cigar. then i changed the thermostat on the humidifier and nothing
i opened up the furnace. the 2 wires black and white are running to a transponder then from their the white is plugged into NEUTRAL and the black plugged into L1

ANY thoughts on the himidifer turning on and off when the furnace goes on?

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Old 01-23-2013, 03:06 PM   #2
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Humidifier keeps running water even when furnace off


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Originally Posted by 2funr1 View Post
Hey Guys, my humidifier keeps running water even when the furnace turns off
water keeps going through the soilniod valve and keeps running.
i thought it was a faulty soilnoid valve so i replaced it and no cigar. then i changed the thermostat on the humidifier and nothing
i opened up the furnace. the 2 wires black and white are running to a transponder then from their the white is plugged into NEUTRAL and the black plugged into L1

ANY thoughts on the himidifer turning on and off when the furnace goes on?
it is wired wrong...should have its own transformer wired on the control board neutral...and black on hum terminal...post a picture if you can..

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Old 01-23-2013, 03:18 PM   #3
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Humidifier keeps running water even when furnace off


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Old 01-23-2013, 03:22 PM   #4
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Humidifier keeps running water even when furnace off


this is the transformer and the 2 wires from the are going what you see in the picture above
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Old 01-23-2013, 03:27 PM   #5
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Humidifier keeps running water even when furnace off


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this is the transformer and the 2 wires from the are going what you see in the picture above
is that the tranformer that came with furnace....or was it added with the humidifier??ben sr
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Old 01-23-2013, 03:31 PM   #6
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Humidifier keeps running water even when furnace off


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You see the terminal marked "HUM" just to the right of your circle. Thats where the black wire from the humidifier transformer should go. That will only power the transformer when the blower is on. As it is wired now the transformer is always hot, so any time the humidistat is calling water will run, whether the fan is on or not.
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Old 01-23-2013, 03:33 PM   #7
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Humidifier keeps running water even when furnace off


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is that the tranformer that came with furnace....or was it added with the humidifier??ben sr
i dont know an installer did everything
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Old 01-23-2013, 03:34 PM   #8
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Humidifier keeps running water even when furnace off


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You see the terminal marked "HUM" just to the right of your circle. Thats where the black wire from the humidifier transformer should go. That will only power the transformer when the blower is on. As it is wired now the transformer is always hot, so any time the humidistat is calling water will run, whether the fan is on or not.
so if i change the black wire and put it on HUM all should be well?
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Old 01-23-2013, 04:22 PM   #9
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Humidifier keeps running water even when furnace off


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so if i change the black wire and put it on HUM all should be well?
Assuming that wire goes to the transformer for the humidifier yes I think it should.
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Old 01-23-2013, 06:39 PM   #10
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Humidifier keeps running water even when furnace off


that looks like the transformer form the furnace....if you switch it furnace may not work...ben sr
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Old 01-23-2013, 06:51 PM   #11
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Humidifier keeps running water even when furnace off


ben you are right, i switched the black wire from L1 and put it on HUM. and turned the furnace back on and the fan came on and the furnace wouldent turn on and blow. also would not shut off.just idle switched it back to L1
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Old 01-23-2013, 06:55 PM   #12
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Humidifier keeps running water even when furnace off


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ben you are right, i switched the black wire from L1 and put it on HUM. and turned the furnace back on and the fan came on and the furnace wouldent turn on and blow. also would not shut off.just idle switched it back to L1
you need to trace out the wiring from humidifier and see where it gos...my guess it going to the control board where t stat is hooked up...ben sr
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Old 01-23-2013, 07:02 PM   #13
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Humidifier keeps running water even when furnace off


i just checked again and the 2 wires from the thermostat that is connected to humidifier is going to what you see in the picture and at the bottom. white and black cable is going white -neutral and black-L1. i put the black cable on HUM and the furnace was idling with fan and would not turn on or turn off
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Old 01-23-2013, 07:03 PM   #14
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Humidifier keeps running water even when furnace off


this is a common install for humidifier with added transformer to system...
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Humidifier keeps running water even when furnace off-001.jpg  
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Old 01-23-2013, 07:11 PM   #15
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Humidifier keeps running water even when furnace off


on the transformer their is 12V and 24V what should be plugged into 24V and what in 12V

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