Question about Aprilaire 700 Humidifier

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If the solenoid goes bad, does its simply allow water to flow in at an uncontroled rate? When I turn mine on, water comes out of every seam

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  • Aprilaire Master
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Hi yes the valve could be stuck in the open postion some thing on valve seating stopping it from closing ?

Posted on Feb 06, 2010

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1 Answer

Aprilaire 700 water never shuts off


the float may be bad or sticking allowing water to run continusly even when unit is off.

Nov 06, 2013 | Aprilaire 700 Humidifier

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No water flow


if you hear the solenoid click then you may have a clogged orifice or prefilter. these are both located near the solenoid. the orifice is usually in the feed tube and the filter is in the inlet of the solenoid. Try the orifice first to see if it is clogged. If that is clear the try loosening the compression nut before the solenoid to see if you have water coming to the humidifier some times if a needle valve was used they get bad also. I would recommend changing the needle valve out and putting in a proper side stop valve. Most municipalities do not allow needle valves per there codes.

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Hi we have a honeywell humidifier connected to our furnace we now here a buzzing sound what can this be from?


Hello. the buzzing sound you are hearing is coming from the solenoid valve on your humidifier. This could be due to low water flow going into the solenoid or the valve itself is going bad. I would check the saddle valve first and make sure you are getting a good stream of water to the solenoid valve, sometimes sediment gets built up in the saddle valve preventing water to flow. If the water flow looks good then replace solenoid valve.

Feb 03, 2011 | Honeywell HE365 Humidifier

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When the solenoid activates I have water coming out the top of the solenoid. When I connect the metal tubing which goes from the solenoid to the top of the unit no water flows. The metal tubing has a...


yes, the water will flow to quickly without it. you can use a very small dill bit to clear it. if it flows to fast you can control it using the shut off valve. hope this helps.

Dec 20, 2010 | General Filters 1042-LH Humidifier

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Water is getting to my solenoid valve and the valve is activated as it is warm to the touch. No water on the back side of the valve to the humidifier. It is on sometimes and other times is doesn't work....


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.

Dec 13, 2009 | Honeywell HE220A1019 Whole House...

1 Answer

I have a model #560..turning the humidistat forward until it "clicks" would cause the water to begin flowing..now, after the "click" is heard, the water does not flow into the reservoir. Do you think it's...


turn the saddle valve in and back out. sometimes the small pin hole for the water gets plugged with something over the summer when the units aren't running and just turning the valve in and back out clears it out and allows the water to flow. check to see that you have water flow at the solenoid and if you do then it is probably the solenoid that is bad.

Dec 07, 2009 | Aprilaire Humidifiers

1 Answer

I have a Honeywell House humidifier HE 225A-1006.


In order of probability:
1) (incorrect wiring) Make sure that humidistat is in SERIES wired with the furnace.
2) (shorted wires) Check that two wires to humidistat are not touching...use your glasses if you need them!
3) (bad humidistat) disconnect the humidistat and put an ohmmeter accoss the two terminals when it is turned on you should read 0 ohms, and when off it should read infinate ohms, if not pass both these tests, you need new humidistat.
That is it, there are no other possibilites!

Oct 12, 2009 | Honeywell HE220A1019 Whole House...

1 Answer

Aprilair 760 Humidfier will not stop water flow to EV panel


If the water continues runs nonstop even when the heater is turned off, you might have either a bad solenoid valve or a bad humidistat. Simply disconnect one of the two low voltage wires going into the unit. If the water turns off then your problem is most likely your humidistat or the low voltage wiring. If the water continues to run even when the low voltage is disconnected you have a defective solenoid valve.
Good luck.......

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Water runs out of the bottom of the unit


Check your plastic water orifice. It is in the hose fitting connected to the outlet tube of the water solenoid. It should be a blue one. Mine was completely eaten through, allowing full water flow, and thus overflowing the distribution tray. I replaced mine yesterday and no more water drips. May as well reflace the filter on the inlet tube of the solenoid at the same time. I used a piece of very stiff, but thin, wire formed into a small hook to remove both old parts. Replacements are readily available from multiple sources on line.

Feb 05, 2009 | Aprilaire 700 Humidifier

2 Answers

Water flow through humidifier


I installed this humidifier (and had a lot of trouble installing it!) and was surprised by the flow of water. Mine leaks out of the bottom of the unit so I haven't actually used it yet. I'll try to figure out why it's leaking this weekend. I thought there would be less water flowing through the pad. I suspect that the weight of the unit is causing it to not be plumb so some water is dripping off of the pad and past the drain tray.

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