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Customer Questions and Answers for Heater, Evap by Whirlpool

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    • Part Number: AP4078434
    • MFG Part Number: 67004188
    • Made by: Whirlpool
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For Whirlpool Heater, Evap (Part Number: AP4078434)

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In last 3 months My freezer coil iced up 3 times. 1st time I thawed it 2 days and it was ok after that. It happened again and I was in process of checking continuity when the fan shut down and the unit went into defrost mode. The heater kicked in and it defrosted. Seems to me that all 3 "normal" parts of the defrost system should be ok. Why, then does the coil occassionally ice up - causing the fridge to get too warm? Could it be that the ADC is intermittent? Or maybe the "tight" space the fridge fits into is a problem? Fridge is only 5 yrs old.

Marcus for Model Number MSD2651HEQ

ANSWER Hi Marcus. In my professional opinion is that 90% of the defrost issues stem from the adaptive defrost control board part # 12002495 sending intermittent voltage (Bad defrost relay on the board) And the defrost thermostat part # not closing. I would use a volt/ohm meter part # TJMA-DM1 to assist. you in your diagnosis. Use the supplied wiring diagram to follow that you will find folded in the controls or in the toe kick grill below. Thank You. 

Answered by AppliancePartsPros.com   |   Monday, March 26, 2012

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