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Aprilaire
Humidifier

Model # 445 Official Aprilaire humidifier

Here are the diagrams and repair parts for Official Aprilaire 445 humidifier, as well as links to manuals and error code tables, if available.

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Owner’s manual

Model diagram and schematic

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Showing 10 of 27 parts  |
Humidistat 4258
#25

Model 445 diagram

Humidistat

Part #4258

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

Wick Pad 12
#11

Model 445 diagram

Wick pad

Part #12

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

Valve Sadd 4001
#1

Model 445 diagram

Valve sadd

Part #4001

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

Clip And Screw Set 4086
#19

Model 445 diagram

Clip and screw set

Part #4086

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

Scale Control Insert (12) 4080
#12

Model 445 diagram

Scale control insert (12)

Part #4080

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

Pump Assembly/motor Board 4009
#4

Model 445 diagram

Pump assembly/motor board

Part #4009

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

Float, Float Valve Body And Arm 4087
#2

Model 445 diagram

Float, float valve body and arm

Part #4087

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

Hose And Nozzle 4091
#9

Model 445 diagram

Hose and nozzle

Part #4091

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

Lower Housing 4164
#23

Model 445 diagram

Lower housing

Part #4164

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

Cover 4179
#24

Model 445 diagram

Cover

Part #4179

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

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