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Aprilaire
Humidifier

Model # 224 Official Aprilaire humidifier

Here are the diagrams and repair parts for Official Aprilaire 224 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 23 parts  |
Transformer 4010
#9

Humidifier diagram

Transformer

Part #4010

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

Wick Pad 12
#7

Humidifier diagram

Wick pad

Part #12

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

Automatic Humidifier Control Gasket 4305

#NI03

All parts diagram

Automatic humidifier control gasket

Part #4305

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

Valve 4040
#4

Humidifier diagram

Valve

Part #4040

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

Tube 4042
#6

Humidifier diagram

Tube

Part #4042

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

Automatic Humidifier Control 56

#NI01

All parts diagram

Automatic humidifier control

Part #56

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

Automatic Humidifier Sensor And Shield 4278

#NI02

All parts diagram

Automatic humidifier sensor and shield

Part #4278

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

Humidistat Adapter Plate 4039

#NI07

All parts diagram

Humidistat adapter plate

Part #4039

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

Replacement Kit 4038

#NI06

All parts diagram

Replacement kit

Part #4038

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

Scale Control Insert 4023
#8

Humidifier diagram

Scale control insert

Part #4023

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

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