Quick Question!

Have you ever purchased from PartSelect.com before?

Models > MDDQ40FW1

MDDQ40FW1 Frigidaire Dehumidifier - Overview

Get Parts and Repair Help for MDDQ40FW1

If you know the dehumidifier repair part you need, you can browse the list of all parts on the MDDQ40FW1, or you can search by name or part description. You can also find your part by where it is located on the MDDQ40FW1 by selecting a section below. Installation instructions provided by other do-it-yourselfers will help guide you through your repair.

Search for parts
Keep searches simple, eg. "belt" or "pump". Need help?
$33.62

Compressor Start Relay

The compressor start relay attaches to the compressor in your refrigerator. If your refrigerator will not start, one of the most common parts to fail is the compressor start relay....

$34.67

Float

If the bucket is full indicator on your dehumidifier is on, but the bucket is empty, or your dehumidifier is overflowing, you may have a problem with the float. This device is located near the bucket and moves up as the water level in the bucket rises. The float will trip the water level switch when the bucket is full. This is a safety device to prevent the unit from overflowing. When the switch is tripped, power to the compressor and fan motor circuits is disrupted until the bucket is emptied. Make sure that the float assembly can move or pivot freely so that it can trigger the level switch when the bucket is full. If the assembly is warped or damaged it should be replaced.

$26.74

Auto Shut Off Switch

The auto shut off switch is for dehumidifiers. If the water bucket is not attached properly the switch will ensure the compressor does not run. You may need to perform a continuity...

$6.75

SCREW

$1.24

STRAP-COVER MTG

Water Container Reservoir and Float

$1.13

LENS

This indicator light lens protects bulbs in ranges, ovens, stoves, and humidifiers. The lens keeps the bulb from getting cracked, scratched, and damaged. It is 1 inch long and 1 in...

$99.28

Humidistat Control

This is a humidistat control for a dehumidifier. The humidistat on your dehumidifier responds to the humidity in the air to determine if the appliance should continue to dehumidify or shut off, based on the desired humidity level. This control needs to be replaced if the dehumidifier wont shut off when the desired humidity level is reached. This part is approximately 3.5 inches long and 1.5 inches wide. The part will be easy to replace, simply remove the front cover, remove the humidistat from the bracket, and remove the two push-on wire connectors. Reverse this process to reinstall the control. Be sure to disconnect power to the dehumidifier before completing this repair.

$60.24

BLADE-FAN

$3.90

SCREW

Search Instructions
Keep searches simple, eg. "belt" or "pump". Need help?

Compressor was short cycling

  • Customer: Sherman from Tuttle, OK
  • Difficulty: Easy
  • Time to Complete: 30 - 60 mins
  • Tools Required: Screw drivers
  • 8 of 12 people found this instruction helpful
Removed the cowling with a square drive screw driver, removed the spring clip from the cover of the compressor controls with a screw driver, pulled off the old compressor start relay and replaced it with the new part. Since other problems could have caused the compressor to short cycle this was a "replace the part and hope it would work" since that would be ... read more

The compressor would not run.

  • Customer: Linda from Gurnee, IL
  • Difficulty: Easy
  • Time to Complete: 30 - 60 mins
  • Tools Required: Screw drivers
  • 6 of 10 people found this instruction helpful
I removed the cover, used a multimeter to test the compressor circuit, and found the compressor start relay to be defective.
Ordered a new one and installed it when it arrived. read more

We lost the water float. Needed a replacement

  • Customer: Bob from Omaha, NE
  • Difficulty: Really Easy
  • Time to Complete: Less than 15 mins
  • Tools Required:
  • 3 of 4 people found this instruction helpful
The float has two prongs that fit two snap fasteners on the reservoir tank. I just pressed the float prongs into the snap fasterners and inserted the reservoir tank into the dehumidifier. Turned the switch and pressto! We are in business. read more