How To Repair Your Aprilaire Humidifier

 

Problem:
No water through humidifier.

Test:
1. Verify manual water shut off valve is open.
2. Loosen incoming water line at solenoid valve or float valve. If water squirts out you are OK up to this point. If no water squirts out, go to water valve  & loosen water line at that point. If no water squirts out then the water valve is either closed or plugged with dirt or rust.

 Solution:
Replace saddle valve or clear water valve.

 

 

Problem:
Water to solenoid valve inlet but no water out of solenoid valve.

Test:
Verify the solenoid valve has electricity by turning thermostat way up on furnace to force it to run. Then turn humidistat from maximum to minimum back and forth. This will make the solenoid valve open and close and you should hear a clicking noise at the solenoid valve. If it does click and you still have no water out of the solenoid valve, the solenoid valve is bad and needs replaced.
 

Solution:
 Replace solenoid valve assembly. 
 

 

Problem:
Water to float valve inlet but no water out of float valve.

Solution:
The float valve is plugged, replace float valve assembly.

 

Problem:
Water coming out of solenoid valve will NOT turn off.

Test:
Turn off the power to your furnace, turn the humidistat down to its lowest setting. If water continues to run through the solenoid valve, disconnect the 2 wires going to the solenoid valve. If water continues to run through the solenoid valve you have a bad solenoid valve.

Solution:
Replace solenoid valve assembly

 

 

Problem:
Humidity level in home is too low.

Test:
Verify the humidistat setting is high enough to get where you need the humidity level to be. Also verify that the humidifier is actually running when your heating system comes on. Do this by temporarily raising the thermostat setting as well as the humidity setting. You should be able to hear your humidifier running at that time. If you have a vertical humidifier filter and a drain line attached to the humidifier you should also see a small trickle of water coming out the drain line. This is normal for humidifiers that have an electric solenoid valve on them (except the model 400).

Solution:
Humidifiers require periodic maintenance AT LEAST once per year. The model 400 requires the humidifier filter or pad be replaced before heating season and once during the heating season. The model 445 and 448 have a water basin in them that holds water and also have a float valve assembly. They require maintenance every 2 months during the humidifier season. Humidifier filters or (pads) must be replaced at least once per year (more often if you have very hard water. Humidifier filters are NOT cleanable or washable. Failure to maintain your humidifier and replace the humidifier filters will reduce the capacity of the humidifier, reduce the units life and possibly damage your heating system and ductwork.

 

If the information above does not assist you click on the link below for a complete Aprilaire humidifier testing and diagnosis manual.

 

 

Aprilaire Residential Humidifier Service Manual & Wiring Diagrams

 

Aprilaire Humidifier Maintenance Tune Up KitAprilaire Humidifier Filters, Pads & Parts

 

Toll free (800) 825-2148

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