Defrost Not Working on Whirlpool Refrigerator Model WRF736SDAM11

[DDHEY]

Model Number

WRF736SDAM11

Brand

Whirlpool

Age

6-10 years

Defrost not working on Whirlpool Model Number WRF736SDAM11, Serial Number K34416254, so coils freeze over, but the refrigerator and freezer continue to function properly otherwise. Had a local repair guy come out, and he replaced the defrost sensor, but the coils froze up again about a month later (photo attached), and the fan starts making noise as it begins making contact with the built up ice. Now, the repair guy says the circuit board needs to be replaced, so I took the cover off and there are two boards, the Power Supply Board (W10453401), and the Main Control Board (W10589838). Before I purchase a new board, I would like to know if this is the logical solution.

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[Jake]

The freezer defrost thermostat ONLY comes when you order the freezer evaporator fan motor, Did the repair person replace the freezer evaporator fan motor that comes with the defrost thermostat?

The defrost thermostat(aka Bi-Metal) on this model only comes with the freezer evaporator fan motor.

Here it is below, its the black round part with the metal clip on it:
Evaporator Fan Motor WPW10514110


If the defrost thermostat and defrost heater ohm test good, then the only part left that controls the auto defrost is the control board.

Here's the control board for your model:
WPW10589838 Electronic Control Board


Its also here:

Whirlpool WPW10589838 Control Board (AP6023259) - AppliancePartsPros.com

This is a refrigerator main control board. It manages and monitors the temperature settings of the appliance, including defrosting and cooling times. If the main control board is damaged or no longer working, the refrigerator or freezer could become too warm or cool, stop defrosting, or no...

click.linksynergy.com

The new control board fixed these 2 members units, with this same problem yours is having:

FIXED - Whirlpool Refrigerator WRF736SDAM13 defrost problem - iced up

https://www.applianceblog.com/mainforums/threads/wrf736sdam13-freezer-defrost-problem-iced-up.71169/ Hi jake , I went through your conversation above. I have same model whirlpool WRF736SDAM13. I have same problem which occurred second time in 11 month later. Last time in jan 2019 , Defrost...

www.applianceblog.com

Let us know how it goes, we love updates here.

Jake

 

[DDHEY]

Will do. Thank you for your reply.

 

[Jake]

Glad to help, let us know how it goes.

Jake

 

[DDHEY]

WPW10589838 Electronic Control Board is not available, or at least I have not been able to find one in stock anywhere. What are your thoughts on having a circuit board repair shop fix mine, test it, and then re-install? Savings could be around 50%.

 

[Jake]

What are your thoughts on having a circuit board repair shop fix mine, test it, and then re-install?

That's your choice and that sounds logical to me since its currently out of stock everywhere.

Jake

 

[DDHEY]

That's your choice and that sounds logical to me since its currently out of stock everywhere.

Jake

Just had Whirlpool authorized repair rep come out, and he tested the defrost thermostat and defrost coil. Both tested fine. Service mode 06 Defrost Thermostat shows 02 bi-metal open, so he said the problem is the Board, but he can't find a new one anywhere in the U.S. after checking all suppliers. Based on attached schematic diagram, would a circuit board repair shop need to focus primarily on all P2 #7 board components, or are there other components that could impact the operation of the bi-metal?

 

[Jake]

Based on attached schematic diagram, would a circuit board repair shop need to focus primarily on all P2 #7 board components, or are there other components that could impact the operation of the bi-metal?

That I don't know, sorry.

Hopefully another tech. or member that knows can answer that for you.

Jake