Part Location Diagram of WP12729128 Whirlpool DEFROST HEATER
See part 10 in the diagram
( Grid squares measure 1x1 inch )
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DEFROST HEATER

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PartSelect Number PS11738607
Manufacturer Part Number WP12729128
Manufactured by Whirlpool
Troubleshooting
This part fixes the following symptoms:
Freezer not defrosting | Frost buildup | Fridge too warm
This part works with the following products:
Refrigerator.
This part works with the following products:
Whirlpool, Maytag, Kenmore, KitchenAid.
Part# WP12729128 replaces these:
AP6005557, 12729128
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Questions and Answers

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Holly
January 2, 2020
Freezer fan gets frozen over and blades no longer rotate.
For model number WRF736SDAM13
PartSelect logo
Hi Holly, thank you for your question. When you are having temperature problems in your appliance, there are a few parts that could cause the issue. You can use a multi meter to test most of the parts. Make sure you cut power to your appliance before doing any repairs or tests. First you should test your defrost thermostat. Place the thermostat in ice cold water for 2-3 minutes after removing it from your appliance. It should be reading 0 ohms to be working correctly. Another part to check would be your defrost heater. Remove it from the appliance. It should be reading anywhere between 0 - 50 ohms to be working. You could check your temperature sensor. To find the correct reading for this part you will have to refer to your tech sheet that comes with your appliance. You can usually find this tech sheet behind the bottom grille of your fridge on either the right or left side. These are the most common parts that cause this issue in your appliance. So it is suggested you check them first. Good luck with your repair.

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Jim
June 18, 2019
Where can i get directions to replace the heater?
For model number 596.72383411
PartSelect logo
Hi Jim, thank you for your question. Unfortunately we do not have any instructions for your appliance specifically. However we do have a video that shows how to install a defrost heater. You can view that here: https://www.youtube.com/watch?v=DTDJYrvrQjs. Because your appliance is a bottom freezer, you will have to remove everything from inside of your freezer to get to the back wall panel that hides your evaporator. The defrost heater is underneath the evaporator. Good luck with your repair.

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Dave
February 25, 2019
I have replaced the heater wp12729128 but the freezer still doesn't defrost. I ordered a thermistor w10316760 but it looks nothing like the old one. Your site mentions wpw103383615 could be the correct replacement?
For model number WRF736DAM11
PartSelect logo
Hello Dave, Thank you for your question. Unfortunately I do not show our website suggests to use wpw103383615 in place of W10316760. Based upon reviewing the model I show that while this part may appear different than the original, Whirlpool is still suggesting it will fit. Have a great day!

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Shirley
January 11, 2020
Several times a year we have ice build-up in the freezer area to where the fan hits the ice. We were told by a tech that french door frigs are know for this. He suggested to turn it off for a day two to let it defrost. There must be another reason. Do you have any suggestions.
For model number WRV986FDEM01
PartSelect logo
Hi Shirley. Be sure the doors are closing and sealing fully. It is possible you may need a new gasket. Thank you for your question and good luck with your repair!

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Kyle
March 6, 2020
My freezer won't defrost, i've ordered and replaced the heater but it's still showing the thermostat for the defrost as open on the tech test #6 (02). Which i would assume means it's not connecting. There is a harness i would like to replace on this to try my next trick. I've put a continuity test on the old heater finally and it was good. So not the heater, it has to be this sensor. Please help.
For model number WRF736SDAM13
PartSelect logo
Hi Kyle, Thank you for your question. To verify if the thermistor or sensor is causing the issue, you will need to test it with a multi-meter. Begin by unplugging your refrigerator, then remove the back panel of your refrigerator to locate the main control board. The thermistor will be connected to the main control board. Remove the thermistor from the appliance in order to test them. Before testing them, you will need to place the thermistor(s) in ice water for 5 minutes in order to bring the temperature to 32 degrees F. The thermistor will produce different readings at different temperatures, and the suggested ranges below only apply to thermistors at a temperature of 32 degrees F. With the probes on the terminals and your multi-meter set to Rx1, you should receive a reading of 16,600 ohms (+/- 5 percent). If you receive a reading outside this range, you will need a replacement temperature sensor or thermistor. There are 2 wire harnesses listed under your model number. The part numbers for them are PS11731432 and PS8260195. We hope this helps. Thank you and have a great day.

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Kevin
September 1, 2021
My refrigerator stays at a constant 50 degrees even though it is set on 34. I have switched out the main board and the power board.
For model number WRV986FDEM00
PartSelect logo
Hello Kevin, Thank you for the question. We suggest testing the Thermistor. 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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Caleb
June 19, 2022
Does this French door model have a defrost timer?
For model number WRF736SDAB13
PartSelect logo
Hello Caleb, Thank you for your inquiry. We have researched the model number you have provided and show that this model does not have a defrost timer, it is controlled by the electronic control board. The defrost thermostat is part of the evaporator fan motor. We hope this helps and if you need help placing an order, customer service is open 7 days a week. Please feel free to give us a call. We look forward to hearing from you!

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Juan
February 20, 2023
Evaporator icing up. Thawed freezer out. Started up worked a few days before Evaporator iced up again. Fridge warmed up. Evap fan works. 30ohms across Defrost heater. 56 ohms across thermostat
For model number MFT2574DEM01
PartSelect logo
Hello Juan, thank you for your question. The most common reason for frozen evaporator coils is insufficient airflow. This is commonly caused by a clogged or dirty air filter, backed-up drain clogs, low fan speed on evaporator fan PS11755853 , or a dirty evaporator coil PS11756717. We hope this helps.

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Steve
April 4, 2024
I'm having and issue with Whirlpool WRF736SDAM11 evaporator not defrosting and freezing every couple weeks. The thermistor was replaced. The defrost heating element tests at approximately 29 ohms and the bimetal tested good. The control board was replaced , and the evaporator fan motor operates. The problem of the evaporator freezing over every couple weeks still occurs. Any suggestions?
For model number WRF736SDAM11
PartSelect logo
Hello Steve, thank you for your question! Since you have already replaced the most of the common parts that can cause the issue, there are a few additional things you might want to consider. Make sure there are no obstructions blocking airflow around the evaporator coils. Poor airflow can lead to uneven cooling and frost buildup. Check the door gaskets for any leaks that might be allowing warm air to enter the freezer compartment. Even a small gap in the gasket can lead to frost buildup. Ensure that the refrigerator doors are properly aligned and sealing tightly when closed. Misaligned doors can also lead to warm air entering the freezer compartment. Clean the condenser coils to ensure efficient heat transfer. Dirty coils can cause the compressor to run longer, leading to excessive frost buildup. That the refrigerator and freezer temperatures are set correctly. Improper temperature settings can affect the performance of the defrost system. We hope this solves your problem!

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Luis
September 11, 2019
My fridge stop defrost.The heater is the most common part that need to be replaced or goes bad on the the defrost cycle? It is any other part "like defrost sensor that goes attach to the evaporator coil like in other models that also can go bad on this type of problem? Only the heater is responsible for defrost cycle? No sensor?Thanks luis
For model number WRF736SDAM13
PartSelect logo
Hi Luis, the thermostat sensor also controls the defrost cycle is part w10316760. Thank you for your question and good luck with your repair!

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Model Cross Reference
This part works with the following models:
PartSelect Number: PS11738607
Manufacturer Part Number: WP12729128
Brand
Model Number
Description
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