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Posted on Oct 14, 2008
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Aprilaire 600 valve won't open?? help

I have 24 volts going into the controller, the light is on.There is no power coming out and telling the valve to open. If I hook those wires directly to the selnoid valve it does open. (So it does work)

The only humidity/temp sensor seems to be part of the controller in back or the board and in the air duct.

Any one have some suggestion?

thanks

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  • Jeff Reynold Oct 14, 2008

    When you say "humidistat do you mean the control board? The one that controls the level of humidity...

  • Jeff Reynold Oct 15, 2008

    OH, think I get what you are suggesting: bypass the humidistat and run the wires from the hum screw and common screw directly to the seleniod valve. It will then open when the fan comes on and I can control the humidity by regulating the water. I will regulate it upstream at valve for main water supply.

    I this correct?

    Thanks for your help,

    Mike

  • Jeff Reynold Oct 18, 2008

    Did exactly what you recommended and it's works perfect! Thanks!

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  • Posted on Oct 14, 2008
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Hook one wire to the hum screw on the board if there is not a hum screw hook it to the green screw,go up to the humidifier then back down to the common screw on the board that should make the unit only come on when the fan is running. it sounds like the humidistat is not working correctly

  • Anonymous Oct 15, 2008

    the humidity controller is called a humidistat sorry, if that is not working properly your unit will not run

    but if you bypass it the way i said you can still controll the humidity by limiting the amount of water into the humidifier by closing the water valve a little at a time until you get the desired humidity level in your house i hope this explains better....if not let me know

  • Anonymous Oct 16, 2008

    that is exactly what i am saying no problem for the help i do heating and air for a living

    kevin

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Related Questions:

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Does the aprilaire 600 plug into an outlet? If so, where is the power cord on the humidifier? I have no water and it makes no noise, so I am wondering if it is an electric problem
Hello, no the humidifier does not have a power cord. It needs to be wired to a transformer to provide 24 volts to power it.
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Dec 01, 2011 • Aprilaire 600 Humidifier
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Have Aprilaire 600. Water will not flow thru unit
Hello, most likely the solenoid is bad and must be replaced. If you are getting 24 volts to the solenoid and it does not open replace the solenoid valve.
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Feb 13, 2011 • Aprilaire Humidifiers
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No humidity in house can not see water coming out of solinoid or what ever that device is that the water line goes into and comes out of between the water line and the line going to filter
Hello. the first thing you need to determine is if the solenoid is getting 24 volts when the furnace turns on, you should be getting 24 volts at the solenoid valve. If not you need to start at the transformer and see if you are getting 24 volts there, if not then most likely the transformer is bad and must be replaced, if you are getting 24 volts at the transformer then check the wiring and make sure it;s tight. also check the humidistat and sail switch/ current sensing relay to make sure they are working properly. If you are getting 24 volts at the solenoid valve and is not allowing water thru than it must be replaced.
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Feb 04, 2011 • Aprilaire 600 Humidifier
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Unit is less than a year old and the water does not seem to be entering the unit. the valve is all the way on and nothing is dripping out of the condensation line. Any ideas?
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Jan 19, 2011 • Aprilaire 600 Humidifier
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Jan 08, 2011 • Aprilaire 600 Humidifier
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http://www.aprilaire.com/themes/aa/en/manuals/Owners_Manual_Model_400_550_600_700.pdf
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Dec 21, 2010 • Aprilaire 550 Humidifier
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There is no water coming out, i have an aprilaire 600 model with a manual controler
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Dec 18, 2010 • Aprilaire 600 Humidifier
1helpful
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Aprilaire 600 problem
It sounds like you got it...

The solenoid will not open with only 13 volts to it. Jump or apply the full 24-27 volts to the solenoid and see if it clicks and opens and allows water to flow.

If the valve still won't open or pass water, start looking for a plugged inlet solenoid inlet screen or a faulty solenoid valve as well as a faulty humidistat.
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Jan 06, 2010 • Aprilaire 600 Humidifier
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Aprilaire 600
If the water is always on make shure the 24 volts is hooked up to 24 volts only when the blower is on. Some furnaces have a HUM terminal but make shure it is 24 volts some are 120 volts you must use the transfomer with the AP 600. You may may use a RP50 relay. The setting 5 or 6 is about the avg setting slowly turn down to see if it shuts off .Also make shure the damper is in the winter setting. Hope this helps
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Jan 26, 2008 • Aprilaire 600 Humidifier
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My aprilaire 600 humidifier stays on when the blower shuts off
Make shure the 24 volts is hooked up to power that is only powered up when the blower is running. Some furnaces have a HUM terrminal on control (make shure the HUM is 24 volts some are 120 volts then you must use the transformer supplied with the AP 600). You can use a RP # 50 relay that senses current only when the furnace motor is running on the heating speed. Hope this helps
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Oct 30, 2007 • Aprilaire 600 Humidifier
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