Part Location Diagram of 4388931 Whirlpool Refrigerator Defrost Board
See part 4 in the diagram
Replacing your Whirlpool Refrigerator Refrigerator Defrost Board
( Grid squares measure 1x1 inch )
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Refrigerator Defrost Board

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$256.99
  In Stock

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PartSelect Number PS372260
Manufacturer Part Number 4388931
Manufactured by Whirlpool
Product Description

Refrigerator Defrost Board Specifications

This device acts like a clock. It continually advances and alternates between activating the cooling cycle and the defrost heater.
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Replacing your Whirlpool Refrigerator Refrigerator Defrost Board

Replacing your Whirlpool Refrigerator Refrigerator Defrost Board
Troubleshooting
This part fixes the following symptoms:
Fridge too warm | Freezer not defrosting
This part works with the following products:
Refrigerator.
This part works with the following products:
Whirlpool, Amana, Kenmore, Roper.
Part# 4388931 replaces these:
AP3109393, 901240, 2154674, 2162270, 2162373, 2169266, 2169268, 2188160, 2303825, 4388931
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Customer Repair Stories
 Average Repair Rating: 4.8 / 5.0, 3 reviews. What's this?
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Sorry, we couldn't find any existing installation instruction that matched.
freezer froze up refridge not cold
I unplugged the fridge.Removed the thermostat casing located in the lower part of the refridgerator by removing a few screws. disconnected the wiring plug from the relay board-connected the new board-screwed the new board inplace-put the casing back and replaced those screws. turned fridge back on and HOORAY off we went. i want to add frinding the part and recieving it so quickly was also part of a great savings to me!
Other Parts Used:
  • Benjamin from Mahanoy Plane, PA
  • Difficulty Level:
    Really Easy
  • Total Repair Time:
    15 - 30 mins
  • Tools:
    Screw drivers
39 of 45 people found this instruction helpful.
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evaporator iced up every 5 days or so
Very easy, unscrewed control panel cover (1 screw) which is located under the freezer compartment inside the refrigerator. Took out non working defrost timer installed new one replaced cover, done. Total time: less than 5 minutes.
Other Parts Used:
  • nicholas from riverside, CA
  • Difficulty Level:
    Really Easy
  • Total Repair Time:
    Less than 15 mins
  • Tools:
    Pliers
14 of 18 people found this instruction helpful.
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would not defrost and would not get cold.
Had alot of frost build up, coils were frozen solid. Removed the coil cover to defrost.
Ordered the defrost timer on friday, arrived on saturday. only took 15 minutes to install. Working great
Other Parts Used:
  • Jack from Beardstown, IL
  • Difficulty Level:
    Really Easy
  • Total Repair Time:
    Less than 15 mins
  • Tools:
    Screw drivers
13 of 14 people found this instruction helpful.
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Questions and Answers

Ask our experts a question about this part and we'll get back to you as soon as possible!

8 questions answered by our experts.
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Russ
March 23, 2018
My Whirlpool fridge is warm freezer works fine noticed the evaporator fan is not running , compressor is running and feels very warm
For model number W8RXNGMWQ03
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Hello Russ, thank you for your question! If the fridge is warm, but the freezer remains at the proper temperature AND the evaporator fan motor is not turning you should replace the Evaporator Fan Motor part number WPW10188389. Please enter the part number into the site for current price and availability. Good luck with your repair!

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Minh
August 2, 2018
My freezer and fridge are warm. I checked the evaporator the motor fan is running and i noticed a small frosted around the bimetal thermostat area. I replaced new capacitor, compressor start relay and overload protector and defrost timer. Now i am not sure defrost control board may need to replace?
For model number ER8GHKXMQ03
PartSelect logo
Hello Minh, Thank you for the question. I suggest testing the Clip-On Bimetal Defrost Thermostat with Leads. The best way to do this is to remove the thermostat from the refrigerator so you can control the temperature of the sensor. You can let the sensor warm up to room temperature. With the sensor warmed up to room temperature the sensor should read approximately 6.2K Ohms at 68°F. With the thermistor submerged is a glass full of ice water, the sensor should be very close to 32°F which should read approximately 16.3K Ohms. If the values that you are getting are far off from these readings, then the sensor is bad and should be replaced. Hope this helps!

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Staunchis
February 20, 2019
Freezer and refrigerator not cooling, i only had frost around the bi-mental thermost, i have replaced all of the defrost parts but still not cooling, i replaced the defrost control board first and after two days i could see that the freezer was starting to freeze then it stopped. What else could be causing my problem
For model number t8txnwfwb01
PartSelect logo
Hello Staunchis, thank you for your question. We would recommend testing the Part Number: WPW10662129 Capacitor. Usually if the fridge and freezer stay warm, it has something to do with the capacitor on the compressor. I hope this helps!

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Robert
September 25, 2019
Loud click coming from thermostat cover. On/off sound. A day later i have frost built in freezer and bottom is not cold as it normally would be. I ordered a thermostat. Should i have ordered this part instead?
For model number A8RXNGMWN00
PartSelect logo
Hello Robert, Thank you for the question. If the sound is coming from the Thermostat, it is more then likely the issue. Hope this helps!

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Gordon
August 16, 2021
Parts look up shows a price for a timer but no pic ..is this a defrost timer ? or does this model only have a defrost board (located inside fridge compartment?)
For model number A8RXCGFXW03
PartSelect logo
Hello Gordon, Thank you for your inquiry. This model as a defrost board, which works as the defrost timer. Hope this helps.

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Mike
February 1, 2023
My freezer keep on building ice and not defrosted plus there is on and of noise come from the defrost bord control
For model number Er8yhmxsl00
PartSelect logo
Hello Mike, thank you for reaching out. We have researched the model and found that the issue might be with the Defrost Heater, part number PS11739991. The heater is close to the cooling coils and melts any ice build-up. If the issue remains, we would recommend checking the Defrost Thermostat, part number PS11739696, and Defrost Board, part number PS372260. If you need help placing an order, customer service is open 7 days a week. Thanks again for your great question.

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Related Parts:
Dave
January 5, 2024
Unit no longer cycles on & off, but now runs continuously. Freezer & refrigerator temperatures are OK. Are boondocks so we turn Unit off at night. Have cleaned condensing coils. What else can I check?
For model number WRT316SFDM00
PartSelect logo
Hello Dave, thank you for contacting us. Based on the description that you have provided, the issue is most probably with the defrost control board, part number PS372260. It manages the automatic defrost cycle in the refrigerator. Glad to be of assistance!

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Bob
20 days ago
FRIDGE&FREEZER ARE WARM….FAN RUNS OK
For model number WRT134TFDW00
PartSelect logo
Hello Bob, thank you for your question! Based on the description that you have provided, we would recommend checking the capacitor, part number PS11757023, to fix the issue. We hope that helps!

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Related Parts:
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Model Cross Reference
This part works with the following models:
PartSelect Number: PS372260
Manufacturer Part Number: 4388931
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