Replacing 4040 solenoid valve on humidifier

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Old 10-29-18, 12:41 PM
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Question Replacing 4040 solenoid valve on humidifier

Hi all

New to the forums (and also a general DIY newbie, so please excuse my ignorance) and hoping for some help. Just found out my Lennox Healthy Climate bypass humidifier stopped working. Did some troubleshooting and googling and I think I have identified the solenoid valve as the culprit (the unit is just over 5 years old). I want to replace the valve myself. I've got the water lines all figured out. My question involves the wiring.

Currently, there are two yellow wires coming from the valve which are connected to two brown wires (via wire nuts), one from the humidistat and one from the furnace. There doesn't appear to be any distinguishing marks or labels on the yellow wires. The replacement solenoid has two blue wires coming out of it. How do I know which blue wire to connect to which brown wire?

Thanks in advance for your time and help!
 
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Old 10-29-18, 05:04 PM
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Welcome to the forums.

Yeah..... those solenoids do occasionally fail although it's not very common.
A more typical problem is that they allow water to piss thru when un-powered.

Since we are dealing with AC here...... there is no polarity to the wires.
 
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Old 11-01-18, 03:27 PM
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Thanks very much. Got it wired up and its working again!
 
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Old 11-03-18, 03:31 PM
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Well unfortunately after a couple of days the new solenoid valve seems to have the problem that PJ Max refer to in that it's allowing water to pass through even when unpowered. Not sure if this new valve is defective or if I got the wrong one... have a quick question. The old valve has this line on the label- Ident:05/13. The new replacement valve has this - Ident: 37/13. What does that line refer to? And is the difference important?
 
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Old 11-03-18, 04:08 PM
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05/13 = fifth week or February 2013 production.
37/13 = thirty seventh week or September 2013 production.

Several companies sell replacement solenoids for humidifiers. They are pretty much all the same thing. Some humidifiers use a reducing bushing in the line...... that is moved to the new valve.
 
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