Question about Aprilaire 700 Humidifier

1 Answer

Aprilaire 760 Humidifier water continues to run

After the furnace blower shut down the water continues to run through the humidifier. Do I replace the solenoid valve or is there another solution?

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert whose answer gotĀ voted for 20 times.


    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 135 Answers
Re: Aprilaire 760 Humidifier water continues to run

You need to determine whether the problem is in the solenoid or in the furnace electronics. You could put a voltmeter on the solenoid connection to see if the furnace is still holding the solenoid open after the blower stops. This will tell you whether it is the solenoid or not.

Posted on Feb 19, 2007

Add Your Answer

0 characters

Uploading: 0%


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


3 Points

Related Questions:

1 Answer

Is this unit design to have a continous flow into the drain? My flows all of the time.

Hello, the humidifier should only be running when the furnaces blower motor is running, therefore it should only drain when the humidifier is on and not flow continuously. Usually the humidifier will keep draining water when the solenoid is stuck open and should be replaced with a new solenoid valve.

Feb 04, 2011 | Aprilaire 700 Humidifier

1 Answer

We noticed the humidity went down to 30% and I adjusted the rate to increase Now our Aprilaire 400 says to change the filter. I did that, and it still says to change the filter. The furnace runs fine....

If your humidifier is equipped with a Digital Humidifier Control with Water

Panel change indicator, after replacing the Water Panel, turn the control

knob to the "Test/Reset" position until the "Humidifier On" light blinks to

reset its timer. (Blower must be operating and HVAC calling for heat.) Be sure

to turn the control knob back to it's original setting. If the "Humidifier On"

light continues to blink, your humidifier is in Test mode. DO NOT LEAVE THE

Jan 27, 2011 | Aprilaire 400 Humidifier

1 Answer

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.

Mar 03, 2010 | Aprilaire 700 Humidifier

1 Answer

Loud vibrating noise when the furnace blower starts up.

Try closing damper slightly between humidifier and furnace????

Feb 03, 2010 | Aprilaire 550 Humidifier

1 Answer

Aprilaire 600 humidier: water continuously runs

sounds like you may have it wired to a continuous power source vs one that shuts off with the furnace. The most common wiring is red to C & white to W

Jan 08, 2010 | Aprilaire 600 Humidifier

1 Answer

Aprilaire 760 keeps running.

The humidifier should not turn on untill the furnace blower starts. Since the fan stays on. does the solenoid valve also stay on? If they both stay on you probably have a bad humidistat. If only the blower stays on then the circuit bourd in the humidifier is defective.
Good luck
HVAC Teacher

Feb 06, 2009 | Aprilaire 700 Humidifier

1 Answer

Aprilaire model 760

It could be that the humidistat is not calling for humidity. Make sure that you have the dial turned up all the way (as far as it will go, just to test it) and that the blower on the furnace is running - if the unit is properly wired, the water will not run unless the blower on the furnace is running. This should do the trick. If not, the only other thing would be a bad humidistat. Good Luck!

Dec 14, 2008 | Aprilaire 550 Humidifier

1 Answer

Water does not stop.

soliniod may be stuck. you will need a volt meter to test

Dec 13, 2008 | Aprilaire 700 Humidifier

1 Answer

Aprilaire 700 operating at wrong time

You want the humidifier to run in heat mode which is the r-w1 terminal on the stat.

Nov 17, 2008 | Aprilaire 700 Humidifier

1 Answer

Lots of water run-off from Aprilaire 760 Humidifier

HI would check the filter in side might need changing or cleaning clean out wter tray in side, it could be just a blocked filter , hope this helps

Jan 03, 2008 | Aprilaire 700 Humidifier

Not finding what you are looking for?
Aprilaire 700 Humidifier Logo

880 people viewed this question

Ask a Question

Usually answered in minutes!

Top Aprilaire Humidifiers Experts


Level 3 Expert

1033 Answers


Level 3 Expert

1772 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