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Customer Questions and Answers for Thermostat by Whirlpool

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    • Part Number: AP4078076
    • MFG Part Number: 67003426
    • Made by: Whirlpool
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For Whirlpool Thermostat (Part Number: AP4078076)

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Ice buildup on the freezer coil. Ran the diagnostic and it comes up with a 1S (defrost thermostat shorted) After reading other folks questions, it seems there is no defrost thermostat. I changed the plug in heater module and that didn't fix the problem. (Checked the old one and it tested ok at 30ohms). Does the thermistor have anything to do with that? I did put the control board into a "forced defrost cycle" and that didn't seem to get rid of the ice but I fear the buildup was just too great.

Dadio for Model Number maytag mbf 2255 KEW

ANSWER Hello Dadio, The thermostat 67003426 is also known as a defrost bi metal. If the unit is not defrosting then you will want to check continuity of the bi metal to make sure it is closed. If it is open when cold then it needs to be replaced. You can also check continuity on the defrost heater 67001794. No continuity means it is bad and needs to be replaced. If both check out then you have a faulty control board W10503278. You can test this with a multi-meter TJMA-DMT3. Here is a link on how to use a multi-meter. http://forum.appliancepartspros.com/oven-repair-including-ranges-cooktops/4810-how-check-continuity-ohmmeter.html 

Answered by AppliancePartsPros.com   |   Wednesday, November 21, 2012

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