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Whirlpool Refrigerator WRX988SIBM03 - Voltage for the evaporator fans is varied thru main control board to the fans for speed control?

mwhite82159

Premium Member
Joined
Nov 30, 2021
Messages
6
Location
84790
Model Number
WRX988SIBM03
Brand
Whirlpool
Age
1-5 years
I have a whirlpool refrigerator. WRX988SIBM03. The temp in frig is not functioning correctly. After gaining access to RC evaporator and fan assembly I found the fan not turning and the evap frozen over. After thawing out the evap and checking continuity of the fan motor. I plugged it back in and the fan started to jump. I checked voltages a P-14-3 and 14-4. Voltage was 8.4dc. Can anybody tell me if the voltage coming off the P14 plug is varied depending on the signal the board is recieving from the thermistor. Or if there is any other component involved in varying the voltage to the fan. Or do I just have a bad control board?
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
128,974
Location
Redmond, Oregon
I'm attaching your tech data sheet below.

Do--->Service Test - 3: Evaporator Fan and Air Baffle Motors
--->Control the RC and FC evaporator fan motors by depressing SW3 (01= both fan motors off. 02 = FC fan on).
--->Depress SW3 once to advance. Service Test 3 will flash quickly and advance to tests 13/23 very quickly. The result is RC fan on, pantry air damper on. Pantry air damper will open and close automatically (13 = damper open, 23 = damper closed). Verify airflow inside pantry on left hand side when damper is open (13 displayed). Airflow in pantry will cease when “23” is displayed.
--->Depress SW3 to advance to last step (04 = both RC and FC fans on).

P14-3 P14-4 should be 14 Volts DC constant, run that TEST then check it again at P14-3 P14-4 and tell us what you get.

Here's the FRESH FOOD EVAPORATOR FAN MOTOR(aka RC fan) for your model:

Here's the photo and video of it:
Evaporator Fan Motor W11087438


When you click the part link to it, you will see a video of how to remove and replace it.

If you still only get 8.4 volts then the main control board is bad.

Here's the main control board for your model you can order:
Main Control Board W10843055


You get $60 credit back on your credit card when you return the old one to RepairClinic.

Let us know the results.

Jake
 

Attachments

  • Tech Sheet - W10811273 - Rev B.pdf
    4.2 MB · Views: 36

mwhite82159

Premium Member
Joined
Nov 30, 2021
Messages
6
Location
84790
Thanks Jake. I was afraid you were gonna say that. Fan never does come on during any the test. The highest the voltage ever gets is 8.4 volts. I guess it's time for a new board. Today is the 5th anniversary from the date I purchase of the frig.
 

mwhite82159

Premium Member
Joined
Nov 30, 2021
Messages
6
Location
84790
This is what the fan does during test mode and normal operation
 

Attachments

  • 20211201_092909.mp4
    14.3 MB

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
128,974
Location
Redmond, Oregon
Ok, yes new control board time.

Yes, I saw the video, thanks!

Jake
 
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