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Miele kf 3855 s-6 fridge part not working. Where is the thermostat?

Fridge part of unit does not work. The accumulater thing on the back is not working in any range from 1 to 4. The light comes on when the control is turned from 0 to 1 but the fridge does not cool. I took front panel off to look at the thermostat at the top of the fridge to find only a pcb. I am presuming the problem may be the thermostat. How do i find it please or has anyone have a better idea of what it is. Thanks

Posted by Anonymous on

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The PCB is probably the temperature controller and most likely uses electronic temperature sensors in the refrigerator and freezer sections. Not having seen this model before, I'm guessing, but perhaps there is a problem with defrosting such as a clogged defroster drain tube, and the insulation between the freezer and refrigerator is iced up. This could also coat the refrigerator temperature sensor in ice if it is on the divider between the two compartments, thus fooling the controller into thinking the refrigerator is too cold. A manual defrost or drain tube inspection should rule this out.

Posted on Jul 16, 2017

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wheelshot
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SOURCE: Subzero 590: freezer works, refrigerator not cooling

This is a Sub Zero and many technicians do not realize that these units most all run on 2 separate systems. 2 cold controls 2 compressors 2 evaporators. They share a condenser and condenser fan motor. What you are describing is most likely a bad cold control. It is pretty common for these to get some age and go bad. If you are very savvy with repairs yourself then if you access the compressor area and feel that the compressor on the right is cool and the compressor on the left is warm then you know that the ref. compressor has not been running. UNPLUG THE UNIT OR CUT THE BREAKER OFF. Remove the shelving from the fresh food section and the cover to the lights and the panel below the lights and lean the back panel forward to access the cold control. You will see 3 wires to the cold control. The green wire is the ground wire of corse. Unplug the other 2 wires remembering their location on the control unit. Take a jumper wire and jump these 2 wires. If when you power the unit up the right side compressor comes on then you know that your fresh food cold control is bad. Replace fresh food cold control.

Posted on Apr 11, 2009

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Hi,

Your description is quite complete but is rather baffling. Pls bear with me while we process by elimination. A few basic/working ideas:
  • most designs call for a single compressor to cool the freezer;
  • the cold air in the freezer is drawn towards the fridge to cool that area;
  • this is performed by a fan drawing air in the freezer through the evaporator;
  • most would have a vent or air pathway to guide the freezer air;
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  • some designs have two thermostatic control , 1 for the freezer, 1 for the fridge.
As applied to your concern:
  • compressor is working since freezer is OK;
  • fan is working as you posted but is the air drawn from the freezer, better still, is the air forced/vented into the fridge?
  • could you please check that the air is strongly blown into the fridge area;
  • a little experiment, open the fridge door, look for and press on the door switch, the light should go out, after a lengthy seconds, the fan should trigger on, not only would it be audible, you would notice the frozen air swirling inside the fridge area. If you hold on long enough to the dorr switch, the compressor should kick in (if it is not already running) since the thermostat of the fridge area (if one is present) would sense that the fan is turning but the fridge area is not cooling.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

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So the keys to a good working unit are first to set the freezer so that it is at the desired temperature, then adjust the fridge control to get the desired fridge temperature
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also dirt and hair dust etc build up on most appliances that have a fan so clean the areas around the back and bottom of the unit
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lastly fridges with frost free designs need to have a clear drain from under the freezer all the way down to the bottom where the compressor motor is make sure this is also kept clean
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lastly obviously the fridge and freezer are highly insulated and sealed and these are both important

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