Questions & Answers for: Aprilaire model 400 manual

Constant Red Light on Control Panel Circuit Board Humidifier now does not work. The reset does not work. However there is now a constant red light illuminated on the circuit board within the ...

Aprilaire 400 - Mesh Screen not wet The mesh screen is not consistantly wet...it's only wet in places... There's enough water running through the system, the water just doesn't drip down in a uniform ...

Aprilare 400 - will not run Im not getting any water to the inside pad , I have checked the insert filters , the valve off the waterline- nada. Can it be the selenoid - unit is onoy 5 years old, it ...

the water will not "kick on" so to speak. I have the water will not "kick on" so to speak. I have to manually hold the float down when the heat is on to make the water flow to the filter. we

how do I use the manual thermostat control for an aprilaire humidifier model 400? You have to put a manual resister in the place of the oat termanals at your humidisat.

Not sure if this is the right model, it is attached to my furnace, at any rate, the tech said that the solinoid valve needs to be replaced and the malfunction was caused by "hard water" ...

How to install an Aprilaire 400 humidifier Adding an Aprilaire 400 humidifier to an existing furnace Here is a installation guide ...

After a few hours my Aprilaire 400 makes a constant clicking sound that won't stop. Is it the solenoid? After a few hours my Aprilaire 400 makes a constant clicking sound that won't stop. ...

...400 Manual (not auto/digital) humidifier up straight to a 24v wall outlet instead of to the furnace, will it still work correctly? Or does it need to be powered by the furnace to know when to turn on ...