Here are the diagrams and repair parts for Official Whirlpool AD40LJ2 dehumidifier, 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
Error Codes
Model diagram and schematic
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Showing 10 of 60 parts|
#NI
All parts diagram
Valve kit
Part #978030
Replaced by #978030
?
Manufacturer substitution
This part replaces 978030. Substitute parts can look different from the original.
$40.49 |
33% OFFMSRP : $60.00
In Stock
#NI
All parts diagram
Valve kit
Part #978027
Replaced by #978027
?
Manufacturer substitution
This part replaces 978027. Substitute parts can look different from the original.
$38.69 |
11% OFFPhone Price : $43.69
In Stock
#NI
All parts diagram
Valve kit
Part #978025
Replaced by #WP978025
?
Manufacturer substitution
This part replaces 978025. Substitute parts can look different from the original.
$29.51 |
44% OFFMSRP : $53.00
In Stock
Air flow and control diagram
Cable tie
Part #857547
Replaced by #WPW10339879
?
Manufacturer substitution
This part replaces 857547. Substitute parts can look different from the original.
This item is not returnable
$4.37 |
19% OFFPhone Price : $5.37
In Stock
#NI
All parts diagram
Valve kit
Part #978026
Replaced by #978026
?
Manufacturer substitution
This part replaces 978026. Substitute parts can look different from the original.
$34.19 |
13% OFFPhone Price : $39.19
In Stock
Screw, 8 x 1
Part #488480
Replaced by #WP489069
?
Manufacturer substitution
This part replaces 488480. Substitute parts can look different from the original.
This item is not returnable
$4.39 |
19% OFFPhone Price : $5.39
In Stock
#NI
All parts diagram
Refrigerant access valve, 5/8-in
Part #978029
Replaced by #978029
?
Manufacturer substitution
This part replaces 978029. Substitute parts can look different from the original.
$41.18
In Stock
Cabinet diagram
Float
Part #1172075
Replaced by #WP1172075
?
Manufacturer substitution
This part replaces 1172075. Substitute parts can look different from the original.
This item is not returnable
$3.95 |
20% OFFPhone Price : $4.95
In Stock
Air flow and control diagram
Refrigerator screw
Part #1157158
Replaced by #WP489069
?
Manufacturer substitution
This part replaces 1157158. Substitute parts can look different from the original.
This item is not returnable
$4.39 |
19% OFFPhone Price : $5.39
In Stock
Air flow and control diagram
Fan motor
Part #1183425
Replaced by #4389130
?
Manufacturer substitution
This part replaces 1183425. Substitute parts can look different from the original.
$191.18
In Stock
Most common symptoms to help you fix your dehumidifiers
Choose a symptom to see related dehumidifier repairs.
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Why does my dehumidifier run all the time?
Main causes: dehumidifier too small for the space, bad humidity sensor, faulty evaporator thermistor, low refrigerant, b…
Read more
Why isn't my dehumidifier draining?
Main causes: clogged drain hose, drain hose not properly connected…
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Why won't my dehumidifier turn on?
Main causes: lack of electrical power, wiring failure, electronic control board failure, user interface control failure…
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Why is there frost on my dehumidifier's coil?
Main causes: room temperature below 65 degrees Fahrenheit, control system failure…
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Why isn't my dehumidifier's remote monitor working?
Main causes: weak or dead batteries, out of range, radio frequency interference…
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Why doesn't my dehumidifier remove moisture?
Main causes: dirty air filter, clogged grill, dehumidifier placed too close to the wall, dehumidifier too small for the …
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Why won't my dehumidifier run?
Main causes: collection bucket not installed, collection bucket full of water…
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Why is my dehumidifier noisy?
Main causes: loose fan motor mounting screws, loose compressor mounting bracket screws, bad fan, faulty compressor…
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Why does my dehumidifier leak water?
Main causes: collection bucket not installed correctly, cracked collection bucket, loose drain hose connection…
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Most common repair guides to help fix your dehumidifiers
These step-by-step repair guides will help you safely fix what’s broken on your dehumidifier.
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How to replace a dehumidifier sensor assembly
If the humidifier sensor doesn’t properly detect humidity or evaporator temperature, install a new sensor assembly, foll…
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Repair difficulty
Time required
45 minutes or less
How to replace a dehumidifier user interface control board
If the dehumidifier doesn’t respond when you try to set it, follow these steps to replace it.…
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Repair difficulty
Time required
30 minutes or less
How to replace a dehumidifier electronic control board
If the dehumidifier won’t power up because the control board has failed, use the steps in this repair guide to replace t…
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Repair difficulty
Time required
45 minutes or less
Effective articles & videos to help repair your dehumidifiers
Use the advice and tips in these articles to get the most out of your dehumidifier.
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Wiring schematic symbols explained video
Learn some of the most common symbols found in a wiring diagram and what they mean.…
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How to repair broken or damaged wires video
Learn how to repair broken, frayed or damaged wires in your appliances.…
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How to use a multimeter to test electrical parts video
Learn how to use a multimeter to check for wiring problems in an appliance that's not working…
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