Question about Honeywell HE440A1005 Humidifier

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Water is constantly filling

I have 3 of these humidifiers. One particular unit is constantly filling. The water supply solenoid has been replaced twice. The last time the HVAC guy was at my house he replaced the solenoid valve and said he tested it thoroughly. He said it worked. Within 3 hours of him leaving my house I checked the unit and it was constantly filling again. The solenoid valve is definitely not turning of the water supply even if the power to the solenoid or power to the entire humidifier is disconnected. If the manual water supply valve is closed the water supply stops and the water level in the chlorine filter housing drops 1-2 inches. The water level in the chlorine filter housing of another humidifier unit installed in the same room (different furnace) doesn't react this same way. Any thoughts?

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Re: Water is constantly filling

Have you checked the position and function of the floats in the pan?

Posted on Dec 11, 2007

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Water keeps flowing constantly

Sounds like the solenoid valve on your humidifier is stuck in the open position. Shut off the water supply to it from the saddle valve on the cold water pipe as a temporary fix.

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Try removing the cover, and manually cycling on the controler switch? Does the solenoid click on, next to the humidifier (the unit with the water line running through it, with wires coming out of it)? If it does click on, is water running down the water pad? It doesn't necessarily drain water when it's working correctly. All of the water SHOULD be getting evaporated into the air return duct.

If it's clicking on, but no water is running out, you should check the water supply saddle valve and make sure it wasn't turned off during servicing.

If it's not clicking on, you should test that you are getting voltage (12v-18v DC) to the solenoid. If you're not, check all wiring connections and make sure they're tight. If you still don't get power, you have either a problem with your control unit/humidistat, your DC power supply, or the control board on your furnace. You may need to call a HVAC technician at that point, depending on your comfort level/skill level in that regard.

When you say the solenoid "stays hot" do you mean it's physically hot to the touch? Hotter than the water lines running into it?

If the solenoid is getting hot, it probably has a bad coil, and if you continue to operate it, you will probably burn up your DC power supply.

If you're getting voltage, you have water pressure, and the solenoid is still not opening, replace the solenoid.

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1 Answer

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Hello, if there is water to the solenoid valve but not passing through it than the solenoid valve is malfunctioning and must be replaced. However, if there is no water at the solenoid valve then either the saddle valve or supply line is clogged with sediment. A easy way to chek the solenoid valve is apply power directy to the solenoid valve from the transformer, if it does not open then replace it.

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No, it will not stop flowwing if it is the water supply. A solenoid valve opens the flow everytime there is a call for humidity, but it stops at the humidifier when there is no call, so it will leak from that point until it is fixed or tightened.

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If the water continues runs nonstop even when the heater is turned off, you might have either a bad solenoid valve or a bad humidistat. Simply disconnect one of the two low voltage wires going into the unit. If the water turns off then your problem is most likely your humidistat or the low voltage wiring. If the water continues to run even when the low voltage is disconnected you have a defective solenoid valve.
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I has the same problem with my HE360 unit. The unit was in fact miswired. The head unit red wires were connected directly to the blue solenoid wires, and activated the solenoid without any signal from the humidistat. As soon as the unit is plugged inn, the water starts running without any signal to the unit. If your unit is miswired, the soleniod blue wires need to be cut and connected to the red crimp connectors.

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I had the same problem.
I replaced the solenoid which resulted with the same problem.
I then blocked the drain using a ball valve, that resulted in the humidifier overflowing.
I do have a fault code (3 blinks) indicating failure to fill tank.
However, if this were true, blocking the drain would have solved this problem.
I have replaced the unit with a new one, and it is now working perfectly.
If you have covered all these bases then I suggest replacing your unit. Hopefully it's under warranty.
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Thanks for your Question,
Sounds to me like you have a calcium build up in the Solenoid, which is restricting flow to the unit for proper operation, you might even have a bit of restriction in the copper line feeding the Solenoid, replacement of the solenoid would probably take care of your problem, one quick tip, in the spring and summer months, its a good idea to shut the water off to the unit, this should make the Solenoid last a little longer, hope this was helpful to ya, please let me know, thanks again,

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