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Aprilaire
Humidifier

Model # 440 Official Aprilaire humidifier

Here are the diagrams and repair parts for Official Aprilaire 440 humidifier, as well as links to manuals and error code tables, if available.

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  • In the search box below, enter all or part of the part number or the part’s name.

Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

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Owner’s manual

Model diagram and schematic

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ALL PARTS
Showing 10 of 22 parts  |
Transformer 4010
#11

Model 440 diagram

Transformer

Part #4010

The manufacturer no longer makes this part, and there's no substitute part

Wick Pad 12
#9

Model 440 diagram

Wick pad

Part #12

The manufacturer no longer makes this part, and there's no substitute part

Valve Sadd 4001
#1

Model 440 diagram

Valve sadd

Part #4001

The manufacturer no longer makes this part, and there's no substitute part

Replacement Kit 4038

#NI

All parts diagram

Replacement kit

Part #4038

The manufacturer no longer makes this part, and there's no substitute part

Strainer For Bullet Shaped Solenoid Valve 4103

#NI

All parts diagram

Strainer for bullet shaped solenoid valve

Part #4103

The manufacturer no longer makes this part, and there's no substitute part

Frame 4171
#13

Model 440 diagram

Frame

Part #4171

The manufacturer no longer makes this part, and there's no substitute part

Knob 4166
#6

Model 440 diagram

Knob

Part #4166

The manufacturer no longer makes this part, and there's no substitute part

Stainer 4004
#18

Model 440 diagram

Stainer

Part #4004

The manufacturer no longer makes this part, and there's no substitute part

Tube 4079
#7

Model 440 diagram

Tube

Part #4079

The manufacturer no longer makes this part, and there's no substitute part

Compression Fitting (6) 4076
#2

Model 440 diagram

Compression fitting (6)

Part #4076

The manufacturer no longer makes this part, and there's no substitute part

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