Can’t find your part?   Contact us:
+1-309-603-4777
Sears Parts Direct
Orders

  • Keep track of the models you own in your profile

    Sign in or Register to view or add models

Schedule a repair
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.

There are a couple of ways to find the part or diagram you need:

  • Click a diagram to see the parts shown on that diagram.
  • 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”.

We encourage you to save the model to your profile, so it’s easy to access parts and manuals for your appliance whenever you log in.

For DIY troubleshooting advice and repair guides, visit our repair help section.

Owner’s manual

Model diagram and schematic

SEARCH WITHIN THIS MODEL

?

This is the number corresponding to the part on the diagram / schematic

Search
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

Valve Sadd 4001
#1

Model 440 diagram

Valve sadd

Part #4001

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

Water Distribution Tray 4081
#8

Model 440 diagram

Water distribution tray

Part #4081

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

O-ring 4006

#NI

All parts diagram

O-ring

Part #4006

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

Valve 4040
#4

Model 440 diagram

Valve

Part #4040

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

Compression Fitting And Strainer (6) 4003
#5

Model 440 diagram

Compression fitting and strainer (6)

Part #4003

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

Clip And Screw Set 4086
#17

Model 440 diagram

Clip and screw set

Part #4086

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

Symptoms for gas cooktops

Why won't my cooktop's gas burners ignite or spark?

Main causes: burner igniter switch failure, bad spark module, dirty or damaged spark electrode, wiring failure, lack of …

Read more

Why isn't my cooktop's gas burner heating properly?

Main causes: gas supply problem, faulty pressure regulator, clogs in burner or orifice, burner valve failure…

Read more

Why do my cooktop's spark igniters keep clicking?

Main causes: stuck burner igniter switch, wet igniter switch contacts, faulty spark module…

Read more

Repair guides for gas cooktops

How to replace a spark igniter switch on a gas cooktop

How to replace a spark igniter switch on a gas cooktop

Follow these step-by-step instructions to fix the surface burner ignition system on your gas cooktop by replacing the sp…

Read more
Repair difficulty
Time required
 45 minutes or less
How to replace a spark module on a gas cooktop

How to replace a spark module on a gas cooktop

No flame on your gas cooktop? Installing a new spark module could be the fix you need.…

Read more
Repair difficulty
Time required
 30 minutes or less

Articles and videos for gas cooktops

How is cooking on an electric range different than cooking on a gas stove?

How is cooking on an electric range different than cooking on a gas stove?

Learn about the differences between cooking on gas and electric stoves.…

Read more
5 Holiday Cleaning Tasks Essential to Boosting Your Home’s Image

5 Holiday Cleaning Tasks Essential to Boosting Your Home’s Image

Get tips on completing essential holiday cleaning tasks to brighten your home.…

Read more
How to clean grates and burners on a gas cooktop video

How to clean grates and burners on a gas cooktop video

Find out how to clean the grates and burners on your gas cooktop.…

Read more

Parts & More