Question about Refrigerators

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Hi, I have a defrost problem on my fridge/freezer, ie, the heating element doesn't seem to come on and so over a period of 2 weeks the coils clog up and the temperatures raise. My question is, is the defrost timer intergrated into the pcb on the back lower corner and will i need to replace it. thanks tim model s20d rbb32 and i think the board is 481221778178

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  • timothyelee Sep 09, 2009

    hi thanks for your reply, it's a whirlpool and yes checked the element for continuity not sure where the metal thrmostat is?

  • timothyelee Sep 09, 2009

    thanks for the reply, it's a whirlpool s20d rbb32.
    i checked the heater for continuity and the thermister was mounted ok but I havn't checked it's working properly.
    Definately need to before getting a board

  • Dan Webster
    Dan Webster May 11, 2010

    Check the heater for continuity, if it is good then check the defrost terminator Both of these are pretty much standard but the terminator will have to be at least 25f to close so checking it warm does no good. These newer ice boxes have a thermister mounted on the coils to determine if defrost is needed. The board measures how many times the door has opened and closed and how many times the compressor shuts on and of AND the drop in resistance to the thermister. If all agree the board starts a defrost cycle. Lots of folk buy a new computer board only to find out a crappy cheap thermister is the probo. Make sure the thermister is properly seated in place and reading the correct ohms before blowing any money on non refundable parts. If I had a model number I might have a manual available.

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Did you check your defrost heater and defrost bi-metal thermostat? what brand your fridge..i can't find out by model#, totalcarefl@yahoo.com

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I would begin with the wiring diagram...you will have a better understanding with it...next with everything in place i would bypass the board by jumping line to heater (at the board it was j11 and j8 on mine).. if still no heat....then i would check the heaters resistance (ohms).....if that checked ok i would replace the defrost thermostat which would be in series with the heater...

Posted on Oct 02, 2009

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