Aprilaire Automatic Humidifier Model 700 - In the middle of the night the humidifier just started randomly clicking like it was trying to start. I turned it 'off', then the next day tried to 'test/reset' it. Everything sounds and looks correct when I'm testing, but does nothing when I set it to the correct %humidity & temperature. While testing, the light flashes for the 'Change Water Panel', not sure that means anything, but went ahead and changed the water panel, then did the 'test/reset' and still nothing after I adjusted it. If it works when I test it, then why is it not working when I set it?

SOURCE: Humidifier control .

if humidifier was wired into thermostat circuit for power instead of seperate transformer , this can happen. you need to see if you voltage going to the solenoid valve. if you do , and it isn't opening, the valve is bad . this is assuming that it is using a # 50 relay to come on only when the fan runs . . make sure the water valve is open

SOURCE: aprilaire 600 humidity level too low

you may try running your blower 100% of the time.this should allow the humidifier to stay on even when your not heating. once the humidity level gets to where you want it, you may be able to put the fan selector back to auto. also you mentioned you have a variable blower. this is great if it is set up to run at approx. 20% fan speed when it is not heating or cooling. at 20% you can circulate enough air through the house to humidify without being able to hear the noise of the blower. it will really increase the comfort level of the house if you tend to have hot and cool spots. if it was not set up this way, contact the installer and ask if they can do this for you.

SOURCE: Loud vibrating noise when the furnace blower starts up.

Try closing damper slightly between humidifier and furnace????

SOURCE: i have aprilaire 700 humidifier, running nonstop

Hi check out the stat is working also check water line valve is not stuck open or there is some thing stuck on the seating