Humidifier solenoid not turning off

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Old 08-27-17, 11:05 AM
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Humidifier solenoid not turning off

I posted about this months back but have finally gotten back to working on it and did not resolve my issue before.

I followed this diagram to hook my humidifier up to the nest.
I have also included pictures of my furnace wiring diagram and circuit board.

My issue is, even now in summer when my AC is on the Humidifier is running.
Do I have it wired incorrectly?
Any thoughts or suggestions to diagnose the problem?
Thank you for any help
 
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Old 08-27-17, 11:11 AM
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When you disconnect one of the wires AT the solenoid.... the system stops ?

Your wiring is correct and would mean that the nest is calling for humidity.
You can confirm that by disconnecting the * wire to the nest.
 
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Old 08-27-17, 11:17 AM
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Yes,
I disconnect the * wire from the relay and the system shuts off.
The nest is set Hum.
Hum. only
Don't activate Fan
 
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Old 08-27-17, 11:23 AM
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The nest sub base has a problem.
 
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Old 08-27-17, 11:31 AM
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Thanks, I will contact Nest. I saw some wiring diagrams had wire to R not HUM. Is there an advantage to using R?
 
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Old 08-27-17, 11:56 AM
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You can run it to R. Either way.

The nest still has to tell the relay to close so the R to HUM connections has no effect on that.
 
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