Question about General Filters 1042-LH Humidifier

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Knocking nosie when water enters humidfier

When the furnace turns on and the water enters the humidifier it often clicks and knocks until the furnace turns on. I am not sure what the cause of this may be. If anyone knows or has any ideas, I would greatly appreciate it. Thanks.

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  • dlee33 Dec 23, 2008

    Do I need to change this valve?? The knocking is not just minor clicking it is extremely loud and didn't make this noise the 1st two years we had it installed. Any help would be greatly appreciated. Thanks!

  • redrick2456 Jan 25, 2009

    I have changed the solenoid 3 times and still have the same problem, a very loud rattleing form the solenoid but not all the time sometine not for days them 4 0r 5 times the next day any help with this , first year no problems, unit is 3 years old could there be air in the pipes which causes this problem ,

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That would the the 24volt soleniod valve that the water line attaches to. Steve

Posted on Dec 21, 2008

  • Stephen Evans Dec 23, 2008

    If your sure that is exactly where the sound is coming from yes. you can put a screwdriver up to it and put the handle to your ear then turn it on. this will act like a stethescope of sorts. all the soleniod valves for there humidifiers are universal.

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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.

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Water and motor always run on Aprilaire 760, even when furnace is off.


Hope this solves your problem, look for the humidistat, it should be located on cold air return duct near furnace, make sure it is not set in the on position, if it is, then this is why it is staying on, please set humidistat any where from 20 to 35%, never over 40%. If the humidistat is set properly and is still running, you may have a electrical problem, humidifier circuit should only receive power(24 volts) when the indoor blower motor of furnace receives power, also if you have galvanized plumbing in your home, you may have a piece of rust or lime deposit in the humidifier solenoid valve preventing it from closing, turn water off to humidifier and disconnect water supply line entering solenoid valve inspect & clean protector screen. Good luck.

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