Question about Miele KFN8762SDED Bottom Freezer Refrigerator

16 Answers

Back of Fridge icing up - Miele KFN8762SDED

Hi Philtac please see your comments below. 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 and any other relevant parts. Thanking you in advance. Regards Larry Comment by Philtac, posted on 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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  • 16 more comments 
  • Dino6702 Aug 28, 2008

    The diagram that i was told to look at did not help. It would be better if somebody could tell me where the parts are for my particular model

  • Dino6702 Aug 28, 2008

    So am I right in saying that the coil is hidden behind the polystyrene cover or I am totally barking up the wrong tree

  • Dino6702 Aug 28, 2008

    So am I right in saying that the coil is hidden behind the polystyrene cover or I am totally barking up the wrong tree (see picture attached).

  • Dino6702 Aug 28, 2008

    So once I removed the polystyrene cover it will be obvious where the glass heater and thermination stat is. If this is not the case can you please provide directions to locate these parts.

  • Dino6702 Aug 28, 2008

    from your picture i see that the condennsor coil is underneath the copper tubing. the tubing with the bulge is the high side of system it also has an expansion orifice inside it.the smaller tubing is the low side if there is a freeze up. and there are no obstructions of airflow over coil the thermo coupler that senses temp is faulty. hope this helps.

    So you are saying the thermo coupler is faulty. If this is the case can you point out which part the thermo coupler is and is it a specific refrigerator part or can it be bought elsewhere.

  • Dino6702 Aug 28, 2008

    I can adjust the temperature to whatever I want I just want to stop the back of the fridge icing over (not defrosting) as it is a frost free fridge freezer.

  • Dino6702 Aug 30, 2008

    from your picture i see that the condennsor coil is underneath the copper tubing. the tubing with the bulge is the high side of system it also has an expansion orifice inside it.the smaller tubing is the low side if there is a freeze up. and there are no obstructions of airflow over coil the thermo coupler that senses temp is faulty. hope this helps.

    So you are saying the thermo coupler is faulty. If this is the case can you point out which part the thermo coupler is and is it a specific refrigerator part or can it be bought elsewhere.

  • Dino6702 Aug 30, 2008

    Ok so i can buy a thermo coupler but could somebody point out which part that is please

  • Dino6702 Aug 30, 2008

    Look I feel like i am getting no closer to getting this solved, different people keep giving me different answers. All I want to know is if my fridge is frosting up at the back what is causing it. How do i fix it explained in steps and what parts do I require, and where can they be purchased from.

    Thanks

  • Dino6702 Aug 30, 2008

    Look I feel like i am getting no closer to getting this solved, different people keep giving me different answers. All I want to know is if my fridge is frosting up at the back what is causing it. How do i fix it explained in steps and what parts do I require.

  • Dino6702 Aug 30, 2008

    ok so if I have got a freon leak then how do I fix it.

  • Dino6702 Aug 31, 2008

    Can somebody explain in detail how to replace the thermo coupler and do i have to get the part from the manufacturer or can i get it elsewhere.

  • Dino6702 Sep 03, 2008

    Can somebody explain in detail how to replace the thermo coupler and do i have to get the part from the manufacturer or can i get it elsewhere.

  • Dino6702 Sep 03, 2008

    Hi Ginko,
    If its the thermostat, are you talking about the defrost thermostat i.e. the bi metallic strip. If this is the case does this need to be purchased from the manufacturer (Miele) or can it be purchased elsewhere.

    Thx.

  • Dino6702 Sep 03, 2008

    If its the thermostat, are you talking about the defrost thermostat i.e. the bi metallic strip. If this is the case does this need to be purchased from the manufacturer (Miele) or can it be purchased elsewhere.

  • Dino6702 Sep 18, 2008

    I never rated this solution, I am still not satisfied with the answers I have received.

  • Dino6702 Sep 25, 2008

    I never rated this solution, I am still not satisfied with the answers I have received.

  • Dino6702 Oct 21, 2008

    I never rated this solution, I am still not satisfied with the answers I have received.

×

16 Answers

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Perfect:

"If you started troubleshooting with a specific expert you should contact the expert by using ask me button, here is the expert list : Find Experts"

OR

try this http://www.fixya.com/users/expert-name-goes-here

Posted on Sep 03, 2008

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You can also use an equivanent characteristic thermostat. If manufacturer's thermostat cannot be found, no proble to use another same range that can be well fitted in its positition to replace.

"If its the thermostat, are you talking about the defrost thermostat i.e. the bi metallic strip. If this is the case does this need to be purchased from the manufacturer (Miele) or can it be purchased elsewhere."

Posted on Sep 03, 2008

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The problem I see is that there are things blocking the back of the freezer and what happens is all of the cold air from the freon is forced back into the freon and the freon will release the cold where ever it can. Try re-arraigning the inside of your freezer/fridge. If you have any questions Ask me and I will continue troubleshooting.

RCF

Posted on Sep 03, 2008

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Just click below for spare parts;


http://www.repairclinic.com/SmartSearch/SmartSearch.aspx

http://www.repairclinic.com/0088_4_1.asp

Hope this may help;

Regards,
VOTIT

Posted on Aug 31, 2008

  • LORETO LACARON
    LORETO LACARON Sep 20, 2008

    Defected DEFROST HEATER can cause frost build up on the panel at the back of the freezer,and freezer stop cooling and ice frozen on unit so air could not flow to refrigerator side.Water will coming out caused of unbalanced freezing,and causing the flooding of water in the floor. You must change this defroster heater assembly so it will works normal again..
    Heavy Frost on the Coils
    This is good! This indicates a defrosting system failure which is a simple control problem. It also means that the sealed system (compressor, evaporator coil, and all associated tubing) is fine as wine in summertime. Defrost system problems are easy fixes that anyone with a pulse can do with maybe just a little help from their friends. The problem will either be the defrost timer (or Adaptive Defrost Control board, if so equipped), the defrost thermostat, or the defrost heater. To locate these parts in your fridge, check out these cool, interactive parts diagrams.
    Just click below for more information;


    There are 44 'Do-It-Yourselfer' stories about installing this part

    Hope this may help you;

    Regards,
    VOTIT

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Back of fridge icing up is often the result of a heavy frost build-up on the evaporator coils or a condenser that is clogged with dust, lint, and dirt.

Evaporator coils back of fridge icing up which is often the result of a heavy frost build-up on the evaporator coils. You can't see these coils without removing a panel on the inside of your freezer. A sure sign that there is a build-up is the presence of any frost or ice build-up on the back walls, floor, or ceiling of the freezer. Such a frost build-up usually indicates a problem in the self-defrosting system

The refrigerator is supposed to self-defrost approximately four times in every 24 hour period. If one of the components in the self-defrosting system fails, the refrigerator continues to try to cool. Eventually, though, so much frost builds up on the evaporator coils that the circulating fan can't draw air over the coils. There may still be a small amount of cooling because the coils are icy, but with no air flow over the coils, cooling in the refrigerator compartment is quite limited.

Here's an inexpensive, though inconvenient, way to determine if the problem is with the self-defrosting system. Remove all of the perishable food from the refrigerator and freezer, turn the thermostat in the refrigerator to Off, and leave the doors open for 24 to 48 hours. (Be sure to have several towels ready in case the melting frost and ice causes the drip pan to overflow). This allows the refrigerator to defrost "manually." When the frost and ice build-up has completely melted away, turn the thermostat back to a normal setting. If the refrigerator then cools properly, it indicates a problem with one of three components in the self-defrosting system:

  • The defrost timer
  • The defrost thermostat (also called the bi-metal switch)
  • The defrost heater
If it still does not cool properly, there may be a problem with the refrigerant level or the compressor. You may need to consult with a qualified appliance repair technician to further diagnose the problem

Condenser Self-defrosting refrigerators all have a set of coils and a cooling fan, usually under the refrigerator, that need to be cleaned regularly. If these coils get coated with dust, dirt or lint, the refrigerator may not cool properly. The coils may appear to be a thin, black, wide radiator-like device behind the lower kick-panel. To clean them, disconnect the refrigerator from the power source, use a refrigerator condenser brush . You may not be able to get to all of the condenser from the front, it may be necessary to clean the remainder of the condenser from the rear of the refrigerator.

Posted on Aug 30, 2008

  • Starnley Johnwells
    Starnley Johnwells Aug 30, 2008






    The two that i have mentioned before the other is the timer.

    The timer is located in the fridge side around the controls or at the back of the fridge around the compressor.

    There is a knob that sticks out the timer that you can turn using a screwdriver.

    By slowly turning this you can manually put the fridge in the defrost cycle.

    If there is a great amount of ice build up it will take awhile to see this start to defrost.

    Here is a picture of the timer.




    defrost heater and thermostat.

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  • 763 Answers

It seems to be the problem is the freon like almost problems of freezing or cooling device. look for an expert technician that could add up a freon.

cheers
CHARCOIS

Posted on Aug 30, 2008

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Remove ur rear side panel of ur refrigerator ...from there u ll see the motor where the shaft connected to the fan...inside motor oly a coil ll present..if ur coil burnout means...remove ur motor and replace the coil based on the power of motor..

Posted on Aug 30, 2008

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Can be bought elsewhere.
thanks
rate the solution.

Posted on Aug 30, 2008

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Self-defrosting refrigerators all have a set of coils and a cooling fan, usually under the refrigerator, that need to be cleaned regularly. If these coils get coated with dust, dirt or lint, the refrigerator may not cool properly. The coils may appear to be a thin, black, wide radiator-like device behind the lower kick-panel. To clean them, disconnect the refrigerator from the power source, use a refrigerator condenser brush (see the Appliance Accessories section) and your vacuum cleaner to clean the coils of any lint, pet hair, etc. You may not be able to get to all of the condenser from the front, it may be necessary to clean the remainder of the condenser from the rear of the refrigerator.

Posted on Aug 28, 2008

  • micromaster
    micromaster Aug 28, 2008

    If it still
    does not cool properly, there may be a problem with the refrigerant
    level or the compressor. You may need to consult with a qualified
    appliance repair technician to further diagnose the problem

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  • If the temperature is too low and you can't make it warmer by adjusting the thermostat, you probably have a defective thermostat. If so, you need to replace it, because they cannot be repaired. Other possible problems are a leak in the sealed (refrigerant) system, cold air migration (in side-by-side models) or a defective air damper. These problems can be quite difficult to locate and correct. It is recommended you contact a qualified appliance repair technician.

  • Posted on Aug 28, 2008

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    From your picture i see that the condennsor coil is underneath the copper tubing. the tubing with the bulge is the high side of system it also has an expansion orifice inside it.the smaller tubing is the low side if there is a freeze up. and there are no obstructions of airflow over coil the thermo coupler that senses temp is faulty. hope this helps.

    Posted on Aug 28, 2008

    • Ronald Mueller
      Ronald Mueller Aug 30, 2008

      the thermo coupler is the very thin copper tube that runs close to the condenssor

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    Generally when you have freezing up as you have described it means there could be a freon leak,the long detailed discription he gave told you nothing but a lot of gibberish that no one would understand check the unit for a freon leak

    Posted on Aug 28, 2008

    • Ronnie Houston Aug 30, 2008

      if you see a green area on any of the copper tubing you will find you have a leak its pretty simple to look for and if the copper has turned green anywhere then youve located the problem

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    What to do.where to do. and.how to do.for all this problems.
    the link will help you.
    http://www.fridgedoctor.com

    pls do rate the solution

    thanks.
    regards.
    fixya expert team

    Posted on Aug 28, 2008

    • tech expert12 Aug 28, 2008

      you are very correct.you are following the right direction.thanks.

    • tech expert12 Sep 03, 2008

      both the options you are talking are applicable.you can get from anywhere you want.

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    If you started troubleshooting with a specific expert you should contact the expert by using ask me button, here is the expert list : Find Experts

    Posted on Aug 28, 2008

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    HI,

    Please click on the below link.Once you ope that link you will see a diagram for the Freezer on bottom model.Just scroll your mouse on that diagram to get detailed info. about the parts and were they are.

    http://www.repairclinic.com/0100_3.asp

    Posted on Aug 28, 2008

    • Priya darshan Aug 28, 2008

      Evaporator coils are always located in the freezer section,either behind back wall or under freezer floor.

      Please don't forget to accept the solution as fixya.


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    • 83 Answers

    Error in the apparatus Defensive
    Switch-headed

    Posted on Aug 28, 2008

    • soufian mankou
      soufian mankou Aug 28, 2008

      Or error behind the cooling over there!
      (Wires someone burnt by the pressure)

    • soufian mankou
      soufian mankou Aug 28, 2008

      Enter This Site And Remebre : (This Site sh specialy manufactured For **Y0U**)

      Click Here Please

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    Back of Fridge icing up


    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.

    May 17, 2008 | Miele KFN8762SDED Bottom Freezer...

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