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Whirlpool
Dehumidifier

Model # D40A1 Official Whirlpool dehumidifier

Here are the diagrams and repair parts for Official Whirlpool D40A1 dehumidifier, as well as links to manuals and error code tables, if available.

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Error Codes

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Showing 10 of 80 parts  |
Screw 489073
#8

Cabinet diagram

Screw

Part #489073

Replaced by #WP488729

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Manufacturer substitution
This part replaces 489073. Substitute parts can look different from the original.
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Washer 647338
#12C

Cabinet diagram

Washer

Part #647338

Replaced by #285448A

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Manufacturer substitution
This part replaces 647338. Substitute parts can look different from the original.
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Wire Tie 602851
#25

Airflow and control diagram

Wire tie

Part #602851

Replaced by #WPW10339879

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Manufacturer substitution
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Valve Kit 978030
#12K

Cabinet diagram

Valve kit

Part #978030

Replaced by #978030

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Manufacturer substitution
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$40.49 | 
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Refrigerant Access Valve, 5/8-in 978029
#12J

Cabinet diagram

Refrigerant access valve, 5/8-in

Part #978029

Replaced by #978029

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Manufacturer substitution
This part replaces 978029. Substitute parts can look different from the original.
$41.18
In Stock
Sealer 212643
#12M

Cabinet diagram

Sealer

Part #212643

Replaced by #212643

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Manufacturer substitution
This part replaces 212643. Substitute parts can look different from the original.
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$50.09 | 
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Screw 488234
#8

Airflow and control diagram

Screw

Part #488234

Replaced by #WP488234

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Manufacturer substitution
This part replaces 488234. Substitute parts can look different from the original.
This item is not returnable
$4.20
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Bend 855199
#36

Unit diagram

Bend

Part #855199

Replaced by #WP855199

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Manufacturer substitution
This part replaces 855199. Substitute parts can look different from the original.
This item is not returnable
$4.33
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Washer 489083
#21A

Airflow and control diagram

Washer

Part #489083

Replaced by #STD551025

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Manufacturer substitution
This part replaces 489083. Substitute parts can look different from the original.
This item is not returnable
$2.49 | 
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Valve Kit 978025
#12F

Cabinet diagram

Valve kit

Part #978025

Replaced by #WP978025

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Manufacturer substitution
This part replaces 978025. Substitute parts can look different from the original.
$29.51 | 
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Most common symptoms to help you fix your dehumidifiers

Choose a symptom to see related dehumidifier repairs.

View all

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…

Read more

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

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

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.…

Read more
Repair difficulty
Time required
 30 minutes or less
How to replace a dehumidifier electronic control board

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…

Read more
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

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

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

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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