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Hello, apply power directly from transformer to solenoid valve, it it does not turn on the solenoid valve must be replaced. If there is no voltage to the solenoid then follow the wires back and see where there is no voltage.
This is typical especially if there is not much air flow across the humidifier. Make sure the fan is running in the humidiifier and the core does not need to be replaced. Sometimes I have had to turn the water valve back a little to cause less water to go through to conserve that wasted water.
Aprilaire, a manufacturer of indoor air quality products including thermostats, air cleaners and dehumidifiers, also offers a line of whole house humidifiers. Installed in your existing heating and cooling system, humidity is produced by a supplied water source that flows over a water panel before being distributed throughout your air through the heating and cooling system. Issues you may need to troubleshoot with your Aprilaire humidifier include error messages and the unit producing too little or too much humidity.
Things You'll Need:
Replacement water panel
Turn down the control dial by one setting if condensation appears on your windows or walls.
Turn up the control dial by one setting if there is a lack of humidity, often indicated by dry skin or peeling wallpaper or paint.
Turn the control dial to "Test/Reset" if the humidifier does not run. Verify the heating and air conditioning unit blower is operating. If the heating and air conditioning unit is not operating or you are unable to resolve the issue contact a heating contractor.
Contact a heating contractor if you turn the control dial to "Off" and the humidifier continues to run.
Contact your Aprilaire dealer (see Resources) if you notice an error code on the display and the "Call Dealer for Service" light flashes.
Turn the control dial to "Off" and turn off the water supply if the yellow "Change Water Panel" light flashes. Lift the front panel off of the humidifier. Slide out the water panel. Insert a new water panel. Replace the front cover. Turn the control dial to "Test/Reset" until the "Humidifier On" light flashes. If you feel uncomfortable changing the water panel, contact a heating contractor.
Tips & Warnings
Purchase replacement water panels through your Aprilaire dealer or a heating contractor.
I'm no expert, but those who are seem to agree that the first thing to check is your evaporator panel. Aprilaire recommends replacing it annually--so if you haven't replaced it recently, that would be the first step to take. Next, check the power supply to your Aprilaire unit. Turn the humidistat to 0%, and then turn it slowly back toward 35% until you hear a click at the unit. If you don't hear a click, you'll want to check that the unit is in fact getting electric power (you may want to get an electrician or furnace tech to do this). If you do hear the click, the next thing to check is whether you have sufficient water flow to your Aprilaire unit. On mine, I had to adjust my water supply saddle valve, as well as the inline valve on the discharge side of the solenoid (see prior post from this morning)--and this seemed to clear the lines and restore water flow. Once you achieve proper water flow, you will probably want to set your humidistat at 35% for winter temps of around 20 degrees F--but be sure to adjust it downward for colder weather. Comments, anyone?
I've been working on the Aprilaire 110 unit today, after encountering the same problem. Here's how I fixed it: First, with the humidistat turned to 0%, I turned off the water supply saddle valve all the way (all the way to the right)--and then turned it back on all the way (all the way left). Still no water flow. Second, I slightly loosened the inline valve nut on the discharge side of the solenoid on the side of the 110 unit. Water began flowing, so I tightened it back up; and now the water flows freely. Conclusion: You may have some mineral deposit buildup in your lines, as I apparently did.