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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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ALL PARTS
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

Frame 4171
#21

Model 445 diagram

Frame

Part #4171

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

Cover 4179
#24

Model 445 diagram

Cover

Part #4179

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

Pump 4100
#5

Model 445 diagram

Pump

Part #4100

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

Resevoir Liner (8) 4093
#14

Model 445 diagram

Resevoir liner (8)

Part #4093

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

Float (only) 4088
#3

Model 445 diagram

Float (only)

Part #4088

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

Humidistat Adapter Plate 4039

#NI

All parts diagram

Humidistat adapter plate

Part #4039

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

Symptoms for top-mount refrigerators

Why is there water in the bottom of the fridge under vegetable drawers?

Main causes: frozen or clogged defrost drain tube, cracked water system tubing…

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Repair guides for top-mount refrigerators

How to replace a door gasket in a top-freezer refrigerator

How to replace a door gasket in a top-freezer refrigerator

The door gasket seals the gap around the door to keep the cold air in and the warm air out. It’s easy to replace a worn …

Read more
Repair difficulty
Time required
 15 minutes or less
How to replace the defrost thermistor in a top-freezer refrigerator

How to replace the defrost thermistor in a top-freezer refrigerator

The defrost thermistor attaches to the evaporator coil and measures the evaporator coil temperature during defrost.…

Read more
Repair difficulty
Time required
 15 minutes or less
How to replace the defrost heater in a top-freezer refrigerator

How to replace the defrost heater in a top-freezer refrigerator

The refrigerator defrost heater melts frost from the freezer’s evaporator fins. Replace the defrost heater if it doesn't…

Read more
Repair difficulty
Time required
 30 minutes or less

Articles and videos for top-mount refrigerators

How to Replace the Water Filter in a GE Refrigerator

How to Replace the Water Filter in a GE Refrigerator

See how to install the water filter on your GE refrigerator, no matter the filter type or refrigerator style.…

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How to Replace the Water Filter in a Maytag Refrigerator

How to Replace the Water Filter in a Maytag Refrigerator

No matter what style Maytag refrigerator you have, we can walk you through replacing the water filter.…

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How to Replace the Water Filter in a Frigidaire Refrigerator

How to Replace the Water Filter in a Frigidaire Refrigerator

No matter what style Frigidaire refrigerator you own, we can help you replace the water filter.…

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