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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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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  |
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

Transformer 4010
#11

Model 440 diagram

Transformer

Part #4010

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

Tube-drain 4047

#NI

All parts diagram

Tube-drain

Part #4047

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

Humidistat 4016
#12

Model 440 diagram

Humidistat

Part #4016

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

Valve 4040
#4

Model 440 diagram

Valve

Part #4040

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

Stainer 4004
#18

Model 440 diagram

Stainer

Part #4004

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

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