Question about Aprilaire 400 Humidifier

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No water going to humidifier

I replaced filter. Not getting water past the solenoid at the base of humidifier. We have hard water here, could that have clogged the solenoid?

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Easy fix: Check the solenoid. Turn off the power to your humidifier and the central air unit. On the side of your humidifier is a brass solenoid. It can get clogged with lime and calcium. Most videos and instruction manuals tell you to replace the solenoid. No need if you can turn a wrench.

1. After all power is off turn the water off to the humidifier and disconnect the top line water line at the nut.

2. Disconnect the bottom line water line that will go to your humidifier.

3. Take a Philips screw driver and remove the two screws that hold the solenoid on the side of the plastic housing of the humidifier.

4. Leave the wires connected unless you need more room to work. If you disconnect the wires then label them with tape (colored) so you put them back on correctly.

5. In the inlet or outlet water pip of the solenoid is a trainer that may be clogged. With a paper clip pull it out and clean it. If it’s clearly clogged then stop and put all back together. That may have been your problem.

6. If it’s not clogged then it may be clogged inside the solenoid.

7. The nut on the end of the solenoid is silver. Take it off and the magnet (main power unit) will slide off.

8. Notice the flat head screw post on the end of the solenoid. Turn it and remove. Be careful as a small spring loaded plunger is inside.

9. Take apart and clean all parts. You should be able to blow air in the intake water line tube and it go out the out water line tube as well as were the plunger hits in the center of the solenoid. If not then it’s clogged.

10. If clogged then just soak all but any parts with rubber or plastic in a small white vinegar solution for a couple of hours to eat away that lime. If it’s not clogged then you probably have a bad solenoid.

11. To check and see if the solenoid is bad just put it all back together but do not re-wire the solenoid to the humidifier.

12. Turn on everything without the wires going to the solenoid (turn on meaning put power back to the unit.

13. When the system is running as it should without the humidifier and solenoid wires attached check the two lead wires with a volt meter for 24v. If you have 24v then you have a bad solenoid and need a new one. If no 24v then you may need a new control panel.

Hope this helps you out.

Posted on Dec 30, 2009

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It could have. Use vinegar and allow it to sit. This should break down the hard water deposits. Good Luck.

Posted on Apr 18, 2008

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