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Water solenoid valve seems to get too hot during operation

The water solenoid valve seems to get too hot when the humidifier is operating. This is the 2nd unit in 2 months. I just got replacement units at Home Depot when they failed under warranty. The humidifier is working now, but the solenoid seems to hot to the touch.

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Posted on Jan 02, 2017

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SOURCE: Aprilaire 760 Humidifier water continues to run

You need to determine whether the problem is in the solenoid or in the furnace electronics. You could put a voltmeter on the solenoid connection to see if the furnace is still holding the solenoid open after the blower stops. This will tell you whether it is the solenoid or not.

Posted on Feb 19, 2007

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SOURCE: water is getting to my solenoid valve and the

Valves do go bad, but I had the same issue and it was the inlet orifice that was plugged.
To fix: Turn off the water supply. Disconnect the water inlet line to the solenoid. The water inlet line connect to ~ 1" long piece that goes into the solenoid. Unscrew the water inlet piece and remove it from the solenoid. Check it for water flow - water should slowly drip out the small orifice at the soleniod side. There is a pin-hole sized orifice on the solenoid side and it doesn't take much to plug it. There is also a narrow cone-shaped filter inside the inlet piece. You can use tweezers to remove the filter and & use a safety pin or sewing needle to clear the orifice. Check the filter, clean it if necessary, and reinstall the filter. Now check for water flow thru the part before reinstalling. Reconnect the water inlet line and turn on the water supply. Turn your humidistat to trigger the humidifier. You should see water flowing through the drain tube.

Posted on Dec 13, 2009

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SOURCE: General Aire 1137 Humidifier fan won't engage.

the lubracation used in the fan motor has an expected life of 5 years... once the lub is gone from the oillite bearings then the fan will stop .. you can put a couple of drops of oil on the motor bearings if you can get to them .. spin it by hand a few times to distribute the oil ... dont use WD40 or Teflon filled Oil .. use a light non gumming machine oil .. since you cant get that oil to permiate the porous bearings (done in a vacuum) then you will have to relube every year or so to keep it going .. you could replace the motor but that might not save much over a new unit .

Posted on Dec 23, 2009

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SOURCE: Testing a Aprilaire Humidifier 600 Controller

if it works in the test mode then it should be okay but you can get a humidity gauge from radio shack and set in the house to see how high or low its is. the humidifier is only going to give a max of 45% humidity

Posted on Dec 31, 2009

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SOURCE: solenoid on Aprilaire whole house humidifier

the solenoid allows water to flow to jet that then runs down the pad the solenoid is control by the stat

Posted on Feb 24, 2010

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Honeywell he220 humidifier problems

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.

Jan 05, 2013 | Honeywell HE220A1019 Whole House...

1 Answer

Our humidifier is not kicking in and operating. after inspecting the filter which i changed out last August, it does not look like it has been operating at all and the house has been dry. I loosed the...

Hello, if you have 24 volts to the solenoid and the valve does not click open then it must be replaced. Also you can aplly power directly to the solenoid from the transformer and see if it will click open to let the water thru. either way looks like you solenoid is bad.

Mar 05, 2011 | Aprilaire 600 Humidifier

2 Answers

I have a aprilaire model 700 humidifier every year I end up replacing a solenoid. This time I replaced the solenoid but it did not fix the problem. I hear a click at the humidstat but the humidifier...

Apply power directly to the solenoid valve from the transformer and check if the solenoid opens and lets water in, If not then the solenoid is bad. If the solenoid does open up by applying power directly from transfomer then check the wiring make sure it's all tight and that the currentsensing relay/sail switch is good. Also i would check to make sure there is a strainer on the inlet of the solenoid valve and that it is clean, sometimes sediment builds up on the inside of the solenoid and can shorten the life of it.

Jan 15, 2011 | Aprilaire 700 Humidifier

1 Answer

Our Aprilaire humidifier has started to make a loud ringing noice. It doesn't last the whole heat cycle but seems to be making the noice for a longer period of time now. What can be the...

The water solenoid valve in your Aprilaire humidifier makes an audible sound anytime it opens and closes. This is normal operation. On occasion a mineral deposit may become lodged in the valve. When this occurs the valve may make a buzzing sound as the plunger is not seating properly. You may dislodge the deposit by lightly tapping the valve.

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Nov 15, 2010 | Aprilaire 700 Humidifier

1 Answer

Solenoid valve won't open

Check for 24v.hum transformer shuold interlock/power up during blower motor hearing speed operation.Make sure its running.also manual mode resistor has to be installed in control panel.a blue plastic tag w/2 ends.

Mar 15, 2010 | Aprilaire 600 Humidifier

1 Answer

760 aprilaire humidifier does not let water to the filter. I have cleaned and checked the lines in and out of solenoid.

Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Your Aprilaire Humidifier is designed to operate in conjunction with your furnace blower motor. Most installers wire a humidifier to operate when the furnace is calling for heat. To determine if your Aprilaire Humidifier is maintaining proper humidity, turn up the heat temperature 5 degrees above the current room temperature on your thermostat and set your humidifier control to call for humidity. The humidifier control is located on the cold air return duct. To set your humidifier control to call for humidity, turn the control dial to the off position and slowly rotate the dial until you hear a “click” on the control. You should also hear a click at the solenoid valve located on your Aprilaire unit. The humidifier control will have a click point at the current relative humidity level in your home. If the current relative humidity is 45% or the outdoor temperature is above 60F, the control will only operate the humidifier in the test mode.
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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.

Mar 10, 2010 | Aprilaire Humidifiers

1 Answer

Humidistat know set to on. Water pressure to

Have you checked to see if the solenoid opens and closes? You should hear a distinct click when the solenoid valve energizes. Depending on the quality of the water in your area, it's possible that the valve is scaled up....again and plugged. If the valve operates, you can usually clean it with a product called CLR which dissolves scale (lime buildup). This will require removal and disassembly of the valve. Please be sure to turn off the power before working on the unit.
Some solenoid valves are equipped with an inlet screen that could also be plugged with scale or debris.

Dec 08, 2009 | Aprilaire 550 Humidifier

1 Answer

Not getting water into the unit. Water is upto the valve. Is it more likely the solenoid valve or the reostat ?

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.

Dec 08, 2009 | General Filters 1042-LH Humidifier

1 Answer

Aprilaire 700 using too much water-------

There is a small oriface that is installed next to the solenoid valve. It sounds like this oriface is missing. It reduces the water flow through the humidifier when it is working properly. You should be able to disassemble the solenoid fittings to check and see if the oriface is in the water line. For a "temporary" fix regulate the water pressure down by closing down on the saddle valve.
Good luck
HVAC Teacher

Feb 25, 2009 | Aprilaire 700 Humidifier

1 Answer

Water feed tube and nozzel seems to plug

What type of plumbing do you have? Galvanized, copper or pvc?

Dec 15, 2008 | Aprilaire 700 Humidifier

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