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 # 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.

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 27 parts  |
Valve Sadd 4001
#1

Model 445 diagram

Valve sadd

Part #4001

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

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

Water Distribution Tray 4081
#10

Model 445 diagram

Water distribution tray

Part #4081

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

Board 4159

#NI

All parts diagram

Board

Part #4159

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

Reservoir Divider 4092
#13

Model 445 diagram

Reservoir divider

Part #4092

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

Reservoir Bolt Kit 4101
#16

Model 445 diagram

Reservoir bolt kit

Part #4101

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

Symptoms for gas water heaters

Why does my water heater's pilot light keep going out?

Main causes: lack of combustion air, ventilation draft, bad thermocouple…

Read more

Articles and videos for gas water heaters

How to enjoy all the online benefits we offer on our Sears PartsDirect website

How to enjoy all the online benefits we offer on our Sears PartsDirect website

Learn about all the convenient features on our Sears PartsDirect website that make your parts purchases easier.…

Read more
Top questions about Sears and Sears PartsDirect

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

Read more

Parts & More