Aprilaire Model 400 Humidifier Repair Parts and Supplies
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Humidifier Water Panels should be replaced annually.
Aprilaire Humidifiers have very few problems. Some problems occur because of neglect to do improper maintenance. If you ever need any parts for your humidifier we have them or can get them. All parts listed on this page are in stock.
Below we have many of the parts and supplies that you need to keep your Aprilaire 400 Humidifier in top working condition!
The Aprilaire Stock #45 Evaporative Media Pad Below fits Aprilaire Humidifier Model: #400
It is recommended that you replace the Aprilaire 400 Humidifier Pads twice annually. That is why they are sold in twin packs of two.
Above Stock #45 Panels are sold in twin packs.
Two Aprilaire Stock #45, Twin Pack Water Panels Only $40.
That is only $10.00 each. They come in a twin packs so this would be four
Aprilaire Stock #45 water panels.
Purchase them by the case of three twin packs and save $6.00 That is Six Aprilaire Water Panels!
Aprilaire Model #4040 Water Solenoid Valve:
Tip: When replacing a solenoid valve with a new valve. This will prevent your new solenoid valve from getting stopped up with sediment. This is accomplished best by using two people. When replacing any solenoid valve, turn off the saddle valve (water valve). Disconnect the water line from the old valve. Hold the disconnected water line into a bucket. Second person, turn the saddle valve (water valve) back on full force to allow sediment and junk to flow into the bucket instead of stopping up the new valve. Install and connect the new 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 also the replacement valve for Bryant Carrier part #4374.
This is a 24 volt valve. All 4040 valves come with installation instructions and a 4004 strainer installed in the inlet side of valve. Comes from the factory in a plastic bag.
Aprilaire Part # 4231 Water Restrictor Orifices
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. Below is an picture with an opportunity for you to purchase.
Aprilaire Model 400 Part #4407 Water Distribution Tray
*All the distribution trays we sell have the black mesh installed inside the tray. Not the white sand like substance in the picture below.
Aprilaire Model 400 Part #4403 Scale Control Insert with Float Chamber
Aprilaire Model 400 Float Assembly Part #4406
Aprilaire Model 400 Part #4410 Water Level Sensor Assembly
Aprilaire Part #4335 Feed Tube With Compression Sleeve
Comes with yellow orifice and 4004 strainer.
Aprilaire Humidifier Transformer Part #4010
Sorry, No Returns on Electrical, Electronic Products Once they Have Been Installed. Please see our return policy.
Supco 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! Pipe dope or Teflon tape is not needed to keep it from leaking.
Aprilaire 400 Complete Parts List:
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