20 Most Recent Aprilaire 700 Humidifier - Page 2 Questions & Answers

Yeah they do need to be replaced from time to time. Make sure you get a water test kit and check your water hardness. You may need a whole home water filter if it is outside of normal ranges. A pretty easy DIY project and relatively inexpensive at the big box stores

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.

The clicking is just the water valve opening. Normal. The other issue could be wiring. Some of these were easy to miswire.

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

do you have a test mode on your humidistat? does it turn on when you put it to test?

Here is a link to your humidifier http://www.iaqsource.com/article.php/my-aprilaire-humidifier-is-leaking-what-to-do-about-it./?id=35

Shut off the main water valve and open some cold water faucets to relieve the pressure. Remove the entire saddle valve and make sure the piercing needle does not remain in the water pipe. Purchase and install a non self-piercing saddle valve and follow the directions. You will need a power drill and 1/4" drill bit for the install. Use teflon tape or paste on the treaded fittings. Test for leaks.

Hello, typically solenoid valves should be replaced every 7 years and they are not very difficult to replace. Just need to shut off water at saddle valve, turn off power to humidifier, and remove mounting hardware. Here is a link to store which sells the solenoid needed for your humidifier. http://www.aprilairehumidifierparts.com/product.php?p=aprilaire_4005&product=111011&category=1686

Did you get the plug back together. And did you plug it back in. Also make sure the Humidistat is set right. Here is site that might help you. Hope this helps.

http://www.aprilairehumidifierparts.com/aprilaire_humidifier.php?model=700&gclid=CLy4zffHnKYCFVZc2godEC51nQ

Test the humidistat-- by taking one of the wires off one of the screws, and touching it to the other-
Does the unit come on?-- Then possibly the humidistat is bad.

Let us know what you find

Mack B

That will work, The HUM feeds power to the humidifier when the fan is operating even in cooling on most models, However the humidistat must also be calling for humidity and probally won't call during the cooling months

Depending on the age of your furnace you may have an aux terminal for a humidifier. If not, you should use the white wire (heat) coming from the homes thermostat to power up the humidistat and ultimately bring on the humidifier. This way it will only run when in heating mode.

Is this a newly installed humidifier?

Hello, since this humidifier has a transformer installed with it, you bring one wire from humidifier to Humidistat and then a wire from humidistat to Transformer. You will need a current sensing relay to turn the humidifier on and off with the Furnace cycle. I will attach a link for a wiring diagram for your Humidifier http://docs.electronicaircleaners.com/aprilaire_700a_installation.pdf