Is the Solenoid supports to get hot? The Solenoid clicks and appears it is turning on. I feel the Solenoid and it is getting really hot and water is not passing through it.

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.

Do you hear the solenoid click. Furnace must be on and humidistat must be up. Do you have the ability to check for 24 volts (2 wires at solenoid). Loosen copper nut at solenoid to see if water is present. (Be careful about water spraying). Loosen nut on humidifier side of solenoid. Could be small blockage in copper line at solenoid.(There is a very small orifice there that could get clogged)
Could be Humidistat also. really need voltage meter to check wiring.

Yes when you turn the dial on the humidistat 24 volts gets sent to the solenoid valve and it will click open and allow water to flow through it.

I would suggest that you locate supply valve to humidifier and loosen compression nut on outlet side to see if you have water at that point. If you do shut valve off and disconnect supply line on incoming water line and make sure it is clean. Check for plugged screens or lime build up. Clean as needed. If you aren't getting any flow thru shut off valve then turn off water supply to the valve and replace it. I hope this helps you. Thanks

Hello,Make sure the heating blower/fan is running when you turn the dial as the humidifier might not have power if there is no heating blower operation.

http://www.appliancefactoryparts.com/humidifiers/helpcenter/breakdowns/honeywell/honeywell-he360a1027.html
A breakdown diagram of parts etc above.
http://www.appliancefactoryparts.com/content/pdfs/110672-4.pdf
Shows you the HE360A.
To me it sounds like it is wired incorrectly, the solenoid should NOT get too hot at all. The PDF above shows wiring data.

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1. No click at the solenoid valve indicates an electrical problem. Contact your heating and air conditioning dealer to further check the electrical components of your Aprilaire Humidifier.

1. The click sound at the solenoid valve indicates there is electricity to the solenoid valve. By turning the dial of your humidifier control to a setting above the “click point” you should see water coming out of the drain line within a few minutes which would indicate your humidifier is working.

1. If the solenoid valve makes a click sound and there is no water draining from the unit, this would indicate the flow of water is being obstructed.

1. To determine if water flow is being obstructed, turn the dial of your humidifier control to the off position. The first location you would want to check for an obstruction would be at the saddle valve located on the water line supplying water to the humidifier. When checking the saddle valve, you want to make sure it is completely open. This can be done by turning the valve all the way to the left. If anything is clogged, it can be dislodged by turning the saddle valve all the way to the right and back to the left. Once this is done, turn the humidifier control dial above the click point and you should see water coming out the drain line.


If water is still not coming out of the drain, check the orifice and in-line strainer to make sure they are not clogged. The orifice is located in the tube on the discharge side of the solenoid valve and the in-line strainer is located on the inlet side of the solenoid valve. You may clear the orifice by inserting a needle through the small opening. Clean the strainer by running it under warm water to dislodge deposits or replace. After clearing and re-installing the orifice and strainer (be sure to double wrench all water connections), turn the humidifier control dial above the click point and you should see water coming out the drain line.

It's more likely to be the valve. Turn the humidistat (rheostat) up and down and listen for a click at the humidifier valve. If it clicks and no water goes through, it's the valve or something in the water supply. The best way to test is to use a meter and check for power at the valve. They sometimes fail even if they appear to be operating. Scale (lime buildup) is usually the cause.

turn the saddle valve in and back out. sometimes the small pin hole for the water gets plugged with something over the summer when the units aren't running and just turning the valve in and back out clears it out and allows the water to flow. check to see that you have water flow at the solenoid and if you do then it is probably the solenoid that is bad.

Hello All,

Was having a similar problem. Disconnected the source line and opened saddle valve. I was getting water to the solenoid but nothing out the other side. My humidistat doesn't have a "test" setting, it's either off or the highest humidity. I held the outbound line in my hand and experimented with adjusting both sadlle valve and humidistat. I didn't get any water until I opened the saddle valve MUCH further than I thought was necessary and turned the humidistat to near the highest setting. Once I had water coming though I experimented with the setting on the humidistat, turning it off and then slowly increasing the humidity until the solenoid clunked and water started coming out. I would recommend anyone having this same problem to open the saddle valve all the way (I was surprised how many turns that took) and set the humiditstat to it's highest setting.

Randall