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I have an aprilaire 568 bypass humidifier. (no fan). The problem I'm seeing is that the water 'valve' is oscillating open/closed. I suspect this is due to a humidity sensor or thermostat going bad. Which should I target for replacement first? (OK it has been cold for the month of Jan - below freezing all month, so I expect the thermostat ). Is there a way of checking this before just replacing it?

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If its opening and closing it sounds to me like a loose wire nut on your 24volts to your water solenoid valve. The only time that the humidifier should come on is in heating mode and then when the furnace gets up to temp and the blower starts. If furnace is older it will have a current sensing relay located in the blower compartment with a plastic box and two wires coming off of it.One of the blower wires( generally RED for low speed) should be going through that sensing relay.If you have some slack in that blower wire try wrapping it around that sensing relay a few times. I would chek all my wire nuts first though before you do the sensing relay. David

Posted on Feb 01, 2009

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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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Aprilaire Humidifier Model 600 squeals shortly after being turned on


I have seen some humidifiers do this becuase of high water pressure. Try closing and opening the saddle valve and see if it helps at all.

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Our Aprilaire humidifier has started to make a loud ringing noice. It doesn't last the whole heat cycle but seems to be making the noice for a longer period of time now. What can be the...


The water solenoid valve in your Aprilaire humidifier makes an audible sound anytime it opens and closes. This is normal operation. On occasion a mineral deposit may become lodged in the valve. When this occurs the valve may make a buzzing sound as the plunger is not seating properly. You may dislodge the deposit by lightly tapping the valve.

Thank you for giving us the opportunity to be of service
Sincerely,

Brad Uselmann
Technical Support
Research Products Corporation

www.aprilaire.com

Nov 15, 2010 | Aprilaire 700 Humidifier

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I have aprilaire 700 humidifier, running nonstop with fan on. and still cant get the humidity above 16%. 3000sq. ft. home


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 power at transformer / valve on water line could be stuck open clean valve out or transformer holding valve open

Dec 31, 2009 | Aprilaire 558 Humidifier

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How do I know my aprilair 760 humidifier is working?


A simple check you can perform on your aprilaire 760 is the following:
1) locate the two brown wires coming out of the 760 (these wires will be wired to tell the 760 to turn on when the hvac bower is on and the humidistat is calling for moisture).
2) temprarily disconnect the two brown wires from the external wiring and then short the wires together. All you're doing here is bypassing the your thermostat and bower-on indicator.

With the 70 unit plugged in to the wall outlet and the two brown wires connected together, both the fan and the solenoid valve (water inlet valve) should both be activated.

Dec 13, 2009 | Aprilaire 700 Humidifier

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There is a small oriface that is installed next to the solenoid valve. It sounds like this oriface is missing. It reduces the water flow through the humidifier when it is working properly. You should be able to disassemble the solenoid fittings to check and see if the oriface is in the water line. For a "temporary" fix regulate the water pressure down by closing down on the saddle valve.
Good luck
HVAC Teacher

Feb 25, 2009 | Aprilaire 700 Humidifier

1 Answer

Aprilaire 600 just installed and showing an error code


No, it is not an accurate statement.

These units have simple configurations They have a water supply similar to a ice making referigerator, an enclosure connected to your supply duct that houses a prop fan and media, a seperate humidistat and a drain for excess water. Your unit may also include fancy controls including an outside thermometer & humidistat to avoid over humidification that can cause problems during freezing weather. The humidistat looks a lot like a thermostat and is located in your living space or in the return duct. The prop fan in the box pulls air from the duct, through evaporation media and back to the duct. An electric solenoid valve releases water that pours over the media.

If the humidiy is below the humidistat seting and the AC/heater is running, the Aprilaire fan starts and the solenoid valve opens. I suspect the facier controls include the flashing warning light.

The warning light spells problem. Aprilaire's customer service should be able to provide guidance for the homeowner in the form of simple checks. I suspect your contractor is avoiding a warentee call and the trip it requires.

A word of caution. These humidifiers can be powered directly from your air conditioning unit control board from an auxiliary connection. If the control board isn't rated to carry the current required by the Aprilaire fan, valve and controls or the Aprilaire encounters and electrical problem, the board can be damaged. This can be avoided by using a relay. The AC board switches a low energy relay. 120 volt house power is connected to load side of the relay and runs the Aprilaire.

My board cooked at a location near this connection, but I can't be sure that the load from the humidifier caused it since four of our neighbors also lost their board. It failed the evening of a snow storm and required a costly emergency after hours service call. The next day a new board required a three hour drive. Fortunately a fan powered propane heater kept our pipes from freezing.

Aug 27, 2008 | Aprilaire 600 Humidifier

1 Answer

Humidifier control .


if humidifier was wired into thermostat circuit for power instead of seperate transformer , this can happen. you need to see if you voltage going to the solenoid valve. if you do , and it isn't opening, the valve is bad . this is assuming that it is using a # 50 relay to come on only when the fan runs . . make sure the water valve is open

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Not sure what type of humidifier you have but if is a power humidifier like the April 700 or 760 they do have a blower motor and it may be the fan blade is broken.But if you have a bypass humidifier is posible that your water solenoid may be making noise because of to much water pressure there is not much to a bypass humidifier, you may want to close the water supply valve a little at a time se if the noise goes away.

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