Question about Aprilaire 1120 Humidifier

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Aprilaire 112 How do I check the water valve? My fan runs but the water doesn't get past the valve.

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Kurt, a couple of things you can check. First when you turn the humidistat do you hear a click from the solenoid? This would indicate that you are in fact getting power. Check the saddle valve from the supply. Turn it in and out to make sure it is not clogged. You should have a inline strainer on the inlet side of the valve. Make sure it is not clogged with deposits. On the discharge side of the valve should be an oriface, make sure that is clog free. If you have an meter you can check for power at the soleniod or pull the harness off and ohm it. Should show continuity. Catriver...post back.

Posted on Oct 15, 2006

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Posted on Jan 02, 2017

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Problem with 2 ....1 on each furnance Aprilaire 700 Humidifiers.. no fan no soilinoid click red light on one when furnance is runing they both worked last year


Odd for both to be out. Check the water supply sometimes corrosion or scale will block the saddle piercing valve. Run it all the way into the pipe. Usually need to spin the little valve handle clockwise. Then back it all the way back to full open and reset humidifier power and furnace power. After that may want to crack open water supply connection right before the solenoid at each humidifier to make sure water is getting to them.

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Has been working well for past 5 years and now the water no longer flows, you can hear it click on and fan runs fine, will not run water in test mode


May be an issue with the solenoid valve. check for voltage at the valve. if there are error codes check the owners manual for cause. I am providing a link to the manual if you don't already have one. the last thing to check would be the control itself. the control and the solenoid valve are the 2 main items for the unit. hope this helps.
http://www.aprilaire.com/themes/aa/en/manuals/AA-Humidifier-Owners.pdf

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Hi check out the stat is working also check water line valve is not stuck open or there is some thing stuck on the seating

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Hi check the stat and see if the water feed is not blocked at the jet seeif you have water to the valve

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I have a aprilaire 112. How do you test the solenoid valve to determine if it working properly?


without using a meter? OK take the water line loose from the humidifier that connects to the solnoid. Turn the humidifier on or raise the humidity and water should flow. Keep in mind that if wired correctly the humidifier will only work when your furnace is running although some can be wired to bring on your furnace. You should hear or feel the click if no water comes out you may have no water flow as these valves are pretty durable and seldom fail

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Disconnect the two yellow wires. The water should stop. If it does you have a bad (or miswired) humidistat. If the water does not stop the solenoid valve is bad. These valves are known to be expensive. You might want to consider replacing the whole unit.
Good luck
HVAC Teacher

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1 Answer

440 Aprilaire Humitifier small solinoid doesn't open


Make shure that the the filter in the bottom of the valve is clean. Turn water off use a 1/2 & 7/16 wrench to take apart the bottom connection on valve use a small screwdriver and push the small screen out and clean then put it back together.Use the same wrenches and take apart the top of valve clean inside valve and clean small orfice in plastic water line put back together. Make shure 24volts is gettin to valve you should her a click when furnace is running or fan. It may take a couple times to clean. Hope this helps

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http://www.aprilaire.com/themes/aa/en/manuals/600a.pdf Read page thirteen and there is a inlet water filter that may be cloggeed. Let me know if you need anything else.

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