Welcome to our Aprilaire, Bryant, Carrier Humidifier Parts Page! We have a Humidifier Troubleshooting Section.

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Having a problem with your humidifier?

Below are listed some procedures for troubleshooting humidifier water problems:

I see problems ever now and then with humidifiers where the water will not flow, or the water will not stop running, even when the humidifier is turned off. In many cases it could be a bad water solenoid valve. Check the following before condemning the water solenoid valve.

Aprilaire's Customer Support Number is: 1-800-334-6011.

We Sell Only Genuine Aprilaire OEM Humidifier Parts!

Please Click here for Aprilaire Model 700, 760 Humidifier Parts & Supplies.

Please Click here for Aprilaire Model 600 Humidifier Parts & Supplies.

Please Click here for Aprilaire Models 550 Humidifier Parts & Supplies.

Please Click here for Aprilaire 560 Parts & Supplies.

Please Click here for Aprilaire 400 Humidifier Parts & Supplies.

Please Click here if you are interested in a low cost universal humidifier water solenoid valve. We sell both 24 volt and 120 universal solenoid valves on this page.

Below we have the most common Aprilaire, Bryant, & Carrier parts & supplies

Aprilaire Model #4040 Water Solenoid Valve:

The Aprilaire Model 4040 Water Solenoid valve pictured below is the exact replacement valve for Aprilaire Humidifier Models: 220, 224, 400, 440, 550, 558 560, 568, 600, 700, 760 768. This valve is the replacement valve for Bryant Carrier part #4374.

*Please note, this is a 24 volt valve. All 4040 valves come with a 4004 strainer installed in the inlet side of valve. Comes from the factory in a plastic bag.

The 4040 valve ships in a plastic bag with instructions:

Aprilaire Model 4005 Water Solenoid Valve:

The Aprilaire Model 4005 Water Solenoid valve pictured below is the exact replacement valve for Aprilaire Humidifier Models: 110 & 112:

Please note, this is a 120 volt valve:

Bryant Carrier Humidifier Water Solenoid Valve EF18LJ241:

The Water Solenoid Valve pictured below replaces many solenoid valves on Bryant humidifiers. The part number is EF18LJ241

Please note, this is a 24 volt DC valve used on many Bryant and Carrier Humidifiers. Bryant Carrier Humidifiers have a rectifier that changes the voltage from AC to DC volts. The rectifier is located in the plug, where the plug, plugs into the solenoid valve.

Aprilaire Water Restrictor Orifices:

Below are pictured, with an opportunity for you to purchase the water restrictor orifices that are the problem many times when your humidifier is not getting water up to the water distribution tray. I would say 90% of the time this little orifice being stopped up is the reason for your humidifier not getting water up to the water distribution tray. There are four different colored restrictors depending on which model humidifier you own. Below is an exploded pictorial picture, part by part break down of how the water supply system looks on Aprilaire models 110, 220, 112, 224, 330, 350, 360, 440, 560, 760 and 550. You can see how small the orifices actually are. You can see how easily these things can become stopped up. We sell these in packs of 2. 

*A note about UPS shipping: Sorry, but UPS does not figure ounces. If a part weighs 2 ounces, UPS considers it as weighing one pound. If the box and part weigh 1lb. 2 ounces, UPS considers it as weighing 2 lbs. You might want to add some other items so you can get your pound's worth! I am sorry about the shipping these orifices most certainly do not weigh a pound, but that is what I am charged.

Aprilaire RP4004 Water Line Strainer

Another problem that could cause water not to flow in your humidifier would be the water line filter strainer stopped up. The water line strainer is letter "C" in the picture below. The RP4004 Water Line Strainer fits many Aprilaire humidifier models. Some of the Aprilaire humidifier models that the 4004 fits are: 550, 400, 600, 700, 760, 760A, 768, 440, 350, 112, & 110. In fact I do not see any of the Aprilaire humidifiers that it doesn't fit!  Below is an picture with an opportunity for you to purchase. Thank You! We would appreciate you business!

Sorry, No Returns on Electrical, Electronic Products Once they Have Been Installed. Please see our return policy.

Aprilaire #4655 Humidistat

Our next humidistat is the Aprilaire Model #4655. This is the new analog manual humidistat that takes the place of the 4016 humidistat. This manual humidistat comes with many of the manual Aprilaire humidifiers. This humidistat comes with mounting screws, installation instructions and operating instructions.

Aprilaire Part #4039 Return Duct Adapter Plate

This adapter plate allows you or your contractor to install the 4016 humidistat into the return air ductwork of your heating/cooling system. It holds the base of the humidistat in the air stream for proper monitoring of the level of humidity in your home.

Self Tapping Water Saddle Valve

*If you loosen the compression nut that goes into your water solenoid valve and no water comes out then there is a good possibility that you need a new saddle valve. The saddle valve has become stopped up with lime deposits or debris.  Please make sure your main water supply is turned off in your home, and the pressure is relieved from the pipes by opening a faucet or two before you attempt to remove the saddle valve. You will get an unexpected shower and a mess if you don't turn off the main water supply and relieve the pressure.  Below is a picture of one of my favorite saddle valves with an opportunity for you to purchase. I especially like it because it is already screwed into the base and ready to go! No pipe dope needed to keep it from leaking!

Aprilaire Humidifier Transformer Part #4010

Aprilaire Scale Control Insert Part #4236

Aprilaire Water Distribution Tray Part #4246

                Above top view of Tray:

Aprilaire Circuit Board  4238 for Aprilaire Humidifier models 760, 768, 760A & 700 This circuit board comes with installation instructions.

Sorry, No Returns on Electrical, Electronic Products Once they Have Been Installed. Please see our return policy.

Aprilaire Water Distribution Tray Part #4218

Aprilaire Drain Spud Part # 4223

Humidifier Installation Accessories:

Below are listed some of the accessories and supplies you might need when installing your humidifier. If your furnace has a humidifier (HUM) terminal on the control board then you will not need the A50 current sensing relay.

Please click here if you have other humidifier installation questions. This will take you to our frequently asked questions page. You can call Aprilaire Customer Support at: 1-800-334-6011 for technical support and other questions.

One accessory that I use on many of my humidifier installations is a Current Sensing Relay. This nifty little relay allows me to quickly set up the humidifier to run only when the furnace blower is running. This eliminates the need for a sail switch or more complex wiring. The relay attaches around the white (most of the time) common lead of your furnace blower motor. When the blower comes on it senses there is current and turns your humidifier on. It is easy to install and comes with complete wiring directions and instructions. The A50 current sensing relay acts like a 24 volt switch. The A50 is not designed for 110 volts. You would need the A51 current sensing relay if you plan on running 110 volts through the relay.

Sorry, No Returns on Electrical, Electronic Products Once they Have Been Installed. Please see our return policy.

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