Question about Miele KFN8762SDED Bottom Freezer Refrigerator

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Back of Fridge icing up

Just lately I have noticed that the back of the fridge has ice building up. This is strange as it is a frost free fridge/freezer. Can somebody please tell me why this is happening

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  • Dino6702 May 18, 2008

    Thanks Philtac,

    The f/f is about 4 years old, how can I tell which component is faulty and where are they situated within the fridge freezer. Is it possible to get hold of an engineering manual. I have already replaced the thermistior in the freezer part so I should have no trouble dismantling the f/f.

  • Dino6702 Aug 25, 2008

    Hi Philtac,

    I tried out your instructions but couldn't find the coil you were going on about. I have attached a picture, could you please point out where the coil is stiuated. Thanking you in advance.

    Regards

    Larry

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If the fan is running you more than likely have a defrost problem.
look at the back wall of the freezer section if it is frosted up. it's not defrosting.
There three components in this system. The defrost heater, the defrost termination stat., and the defrost timer. Newer refrigerators do not have a timer per say it is build into a electronic board usually mounted on the back of the refrigerator under a metal plate. The termination stat is the cheapest part @ $ 25.00. The heater should run @ 50.00 to 70.00. The board could be as much as 200.00 or more. If the refrigerator is over 10 years old you may wish to look into getting a replacement. Appliances are designed to start failing after 10 years old.
My opinion.
If you unplug the refrigerator let it defrost then plug it back in. it will work properly about 3 days before it frosts back up.

Posted on May 18, 2008

  • Phillip Thomas May 18, 2008

    Ok. UNPLUG the refrigeator. Take the shelves out of the freezer. Remove the back cover panel. If the coil is iced up. you can use a hair drier to though ice out. Be careful not to leave hair drier in one place to long the heat could warp the plastic in your liner move it around. Next when the coil is all clear look at the top of the coil there is a little 2 wire component that is straped to the coil. This is the thermination stat. when the coil is cold the bimetalic switch is closed this allows the heater to energise and defrost the coil. It opens when the temp at that spot reaches a set temp. turning off the heater. Then the defrost timer on the board finishes timing out and brings the compressor back on to start another cycle. unclip it from the coil look at it and make sure it's sealed around the top. you can sometimes submerg it in ice water and you will hear it click. if it looks good and it clicks its more than likely good.

    At the bottom of the coil is usually a little metal plate secured by 2 screws. Behind this plate is a glass heater tube. there is a wire into each side connected by a spade terminal. look at the heater see if you can see if it is broke inside sometimes the glass is black looking and hard to see through. If it falls apart in you hands it's bad.

    If both these components are ok. Then your problem is in the electronic board mounted under a meatl plate on the back of the refrigerator. I usually order the boards online from the manufacture. They usually run $185.00 or so. Hopefully your problem is the termination stat or the heater. If you find one component bad replace both. The other could have been damaged in the failure. Hope this helps

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