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 # 550 Official Aprilaire humidifier

Here are the diagrams and repair parts for Official Aprilaire 550 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 24 parts  |
Transformer 4010
#14

Model 550 diagram

Transformer

Part #4010

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

Wick Pad 10
#1

Model 550 diagram

Wick pad

Part #10

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

Valve Sadd 4001
#18

Model 550 diagram

Valve sadd

Part #4001

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

Adptr-vlv 4229

#NI

All parts diagram

Adptr-vlv

Part #4229

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

Panel 4220
#5

Model 550 diagram

Panel

Part #4220

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

Current Sensing Relay 50

#NI

All parts diagram

Current sensing relay

Part #50

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

Base 4219
#4

Model 550 diagram

Base

Part #4219

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

Compression Fitting (6) 4076
#13

Model 550 diagram

Compression fitting (6)

Part #4076

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

Cover 4222
#7

Model 550 diagram

Cover

Part #4222

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

Water Tray 4218
#3

Model 550 diagram

Water tray

Part #4218

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

Parts & More