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Solenoid valve has a clicking noise can it be adjusted

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1 Answer

How do you test a solenoid valve ?


Hello, I like to apply voltage directly to the solenoid valve to see if is working. Just take the two wires from transformer and connect to solenoid valve, if the valve clicks and water starts flowing the valve is good

Oct 29, 2011 | Aprilaire 550 Humidifier

1 Answer

Frequent knocking noise coming from General Aire 1042 LH humidifier


Hello, it depends where the sound is coming from,if it's in the supply water line it could be caused by water hamer or the inlet side of the solenoid valve might be clogged up with sediment. Water hammer is when the solenoid closes under high water pressure and a water hammer arresters should be installed. If the sound is coming directly from the solenoid valve and is more of a chattering sound then there is a loose low voltage wire or the solenoid is going bad. If you disconnect the power to the solenoid and the chattering stops then solenoid must be replaced as it is the cause of the noise.

Mar 17, 2011 | General Filters 1042-LH Humidifier

1 Answer

Loud Ringing or buzzing noise off and on from the humidifer. Do we just need a new filter?


Hello, usually a ringing or buzzing sound comes from the solenoid valve on the humidifier. Make sure that the solenoid valve is getting a solid stream of water to it, sometimes if there is not a good stream of water the solenoid will buzz. if that checks out good than replace the solenoid vlave.

Feb 10, 2011 | Aprilaire 550 Humidifier

1 Answer

Water runs to the solenoid, but doesntt pass through it... Do I need a new solenoid?


Check to see if you are getting 24 volts to the solenoid valve, if you are but the solenoid valve does not click open then the valve is most likely bad. Another thing you can do is apply 24 volts directly to the solenoid valve from the transformer if it does not open then the vlave is bad.

Jan 08, 2011 | 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.


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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

My 550 is bone dry. I've cleaned the small in line screen blew out the line. How do I know if its the selinoid or humidistat?


Turn off the water to the humidifier

Disconnect the water line to the inlet water valve (the solenoid), catch any excess water or drips in a small container

Turn the water back on slowly and see if water flows through the open line (the one you just disconnected - catch the water in a small bucket)

If you have water to the valve, it's probably the solenoid valve - you can test this by reconnecting the water line and turning the humidistat all the way up. You should hear a click as the solenoid tries to open. If it clicks and no water comes out it's the valve. If there is no water to the valve, you'll need to determine the reason(s). Although not every water valve has one, check for a plugged inlet screen at the entry to the water valve (solenoid)
Sometimes the small line tap valves commonly used with humidifiers can plug up or malfunction. If you try to repair or replace the tap valve, make sure the water is turned off.
If no click, it could be the humidistat or there is no power to the unit.
If the humidistat is bad, you won't hear any click and no power will be sent to the solenoid valve. In that case, the humidistat may be defective.

Depending on your comfort level and knowledge, you can try applying power directly to the valve by bypassing the humidistat, but only try this if you are comfortable working with electricity. The voltage should be around 24 volts (in the USA) , which is low, but requires some knowledge.

Dec 29, 2009 | Aprilaire 550 Humidifier

2 Answers

Bad Problem with solenoid valve.


If the valve noise is excessive, or more than it was originally, then yes, replace the valve.

If the noise is no worse than it was originally, then you may be overly sensitive to the noise its making.

Also, check that the valve has not shifted slightly in such a way that it's opening and closing rattles it against something that it didn't used to rattle against. A sheet metal panel will amplify the valve opening and closing.

Let me know what you find.

Dec 12, 2009 | Honeywell Power Humidifier: Furnace...

2 Answers

I have a Honeywell HE225A humidifier installed on my Trane furnace. Due to water noise the solenoid on the unit was disabled and a new solenoid was mounted in the rafters to eliminate the noise. This...


This posted question is exactly one year old, but I just got this solenoid valve assy from ontimemall in Phoenix AZ. I don't have the receipt right here, but it was about $90. It is classified as: honeywell 32001639-002 solenoid valve.

Dec 08, 2009 | Honeywell Humidifiers

1 Answer

Aprilaire 760 furnace humidifier makes a loud screeching sound.


A bad circuit board should not make any noises. A bad solenoid valve could make a loud buzzing noise. If the noise is a squealing noise then you have defective bearings in the blower motor.
If you disconnect the low voltage wiring from the solenoid valve and you still hear the noise, then its not the solenoid valve.

Apr 06, 2009 | Aprilaire 700 Humidifier

2 Answers

Loud "Glonk" when humidifier turns off


Try turning the water valve going to the soleniod down. There may be too much pressure. You may have to replace solenoid one more time after making the adjustment.

Mar 12, 2008 | Aprilaire 700 Humidifier

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