Question about Aprilaire 550 Humidifier

3 Answers

Aprilaire 560 humidifier

I am not getting water to the unit. I removed the water line and it is not clogged so it has to be the unit. What is the likely problem?

Posted by on

3 Answers

  • Level 1:

    An expert who has achieved level 1.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer
Re: Aprilaire 560 humidifier

Hello All,

Was having a similar problem. Disconnected the source line and opened saddle valve. I was getting water to the solenoid but nothing out the other side. My humidistat doesn't have a "test" setting, it's either off or the highest humidity. I held the outbound line in my hand and experimented with adjusting both sadlle valve and humidistat. I didn't get any water until I opened the saddle valve MUCH further than I thought was necessary and turned the humidistat to near the highest setting. Once I had water coming though I experimented with the setting on the humidistat, turning it off and then slowly increasing the humidity until the solenoid clunked and water started coming out. I would recommend anyone having this same problem to open the saddle valve all the way (I was surprised how many turns that took) and set the humiditstat to it's highest setting.


Posted on Apr 17, 2009

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer
Re: Aprilaire 560 humidifier

I have similar problem and need more or further ideas. Saddle vale is open and water is getting to solenoid, but not through it. I have simple dial humidistat and when i do turn this I hear a click at the humidistat but don't really hear anything at the solenoid or the furnace.
Questions now that I read this are: does the furnace need to be on and blowing for the value to open and the water to flow? Is there anything else I should check? I suspect I have dirt clogging the coil area in the furnance because I do have to reset a breaker every now and then. The humidifier has always worked until this winter. Troubleshooting found the saddle value closed so i opened that. Just not seeing water get through. Don't want to spend $50 bucks on a solenoid when so many here have said it did not help. fear it is something else.

Posted on Jan 24, 2008

Re: Aprilaire 560 humidifier

Did you just install this unit, or has it been working for a while and just stopped?
1. If you just installed it, the solenoid wires (yellow) must be hooked up to switch in when you have a call for heat.
a) use a current sense relay OR
b) connect 120V & neutral to "HUM" terminal and neutral on heater control board.
2. If it has worked before, maybe the saddle valve is plugged. Turn the "T" handle all the way clockwise, then all the way out CCW. You can hear the water start flowing. Loosen compression fitting at solenoid valve to make sure water is getting there.
3) Also, you must supply 24V to the circuit to open the solenoid valve. Check your wiring. It depends on the model what way to wire it and I cannot go into that here.
4) Testing: Turn off humidistat control. Turn on heat, wait for blower to come on. Turn humidistat control to test posn. Solenoid valve should click. This will put water into top of Aprilaire tray, after few minutes it will dribble out bottom clear vynl tube to the
Good luck...
Melrose, MA

Posted on Dec 19, 2007

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

Which direction does the plastic sleeve in the compression nut go where it connects the plastic water line to the solinoid on the Aprilaire 560 humidifier? Thanks.

Hello, I have posted a pic of how the sleeve goes onto the tubing, the sleeve in the pic is brass but a plastic sleeve goes on the same way.robhvac47_16.jpg

Feb 05, 2011 | Aprilaire 550 Humidifier

1 Answer

My Aprilaire new water pad has a white substance on it. I mentioned this because twice the pad (tworeleased a sticky, mucous substance that plugged the drain line and caused flooding in my basement. The...

Hello,All the pads have a protectant(white) coating because the pad is aluminum and would rot out fairly quickly from getting wet.The slime is bacteria(fungus) not from the coating that forms from stagnant (sitting) water.Make sure the unit is draining out dry after each cycle.With the pad out pour vinegar OR bleach & water (10:1) to kill the mold in the drain pipe.Do not clean the pad at all ,it gets replaced.They sell an inexpensive wet floor alarm at the store that makes noise when wet.

Oct 12, 2010 | Aprilaire 550 Humidifier

1 Answer

Water running after heater shut off in humidifier

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

1 Answer

My Aprilaire 560 doesn't shut off even if the blower is off.

My Aprilair 560 turns on and off repeatedly.Making a loud banging sound.Changed my water valve worked 1 day and started agin.

Dec 20, 2009 | Aprilaire 550 Humidifier

1 Answer

Aprilaire model 560 pan keeps filling up with water - what adjustments do I need to do?

Here's a link to the manual for your Aprilaire model 560 humidifier you can download and print for free.

According to Aprilaire, it is normal for there to be excess water going into the drain pan. However, the drain pan should have a drain line connected to it so the contaminents from the humidifier can be flushed down a drain and away from the unit. (see page 2 Principle of Operation).

They further state that the water valve should only be either fully on or fully shut off and do not attempt to regulate water flow with the inlet supply valve.

I would give the unit a good cleaning of the pan, locate the drain connection and attach a drain line to your unit as is required for proper operation and function/

Hope you find this Very Helpful - Best regards!

Aug 19, 2009 | Aprilaire Humidifiers

2 Answers

Low or no humidity.

i have an aprilaire model 550 im getting no water to the filter but i am getting water to the solenoid

May 11, 2009 | Aprilaire 550 Humidifier

1 Answer

Water spewing into the reservoir and ovrflowing

Sounds like you do not have an orifice in the water line to regulate the water pressure.

Feb 25, 2009 | Aprilaire 550 Humidifier

1 Answer

Aprilaire 560 constantly drains water

check to see if you have 24 volts between to 2 yellow wires coming out of the water solenoid. if you have 24v, then it is still getting energized to run. if it does not have 24v and the water is still running, the solenoid is stuck open. most likely from water deposits. sometimes you can take the solenoid apart and clean it, but probably better off just getting a new solenoid.

Feb 07, 2009 | Aprilaire Humidifiers

2 Answers

Orifice clogs to Aprilaire 600 look at page thirteen in this manual there is allready a inline filter on the unit. hope this helps

Jan 06, 2009 | Aprilaire 600 Humidifier

Not finding what you are looking for?
Aprilaire 550 Humidifier Logo

3,332 people viewed this question

Ask a Question

Usually answered in minutes!

Top Aprilaire Humidifiers Experts


Level 3 Expert

1033 Answers


Level 3 Expert

1751 Answers

Barrett Palumbo
Barrett Palumbo

Level 2 Expert

1772 Answers

Are you an Aprilaire Humidifier Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides