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Hello.
Yet another Fridge problem! I’ve been scouring the internet for my issue and found this forum to be the best (and most helpful!). There have been a few threads with similar issues so appreciate if any body can confirm if it’s the fridge evaporator sensor that’s broken in mine.
– fridge/freezer is 6 years old
– we defrosted it 3 months ago (behind panel in freezer compartment was caked with solid wall of ice)
– a few weeks ago, noticed fridge was not cooling to temperature. I’ve installed a separate temp. monitor. Fridge seems to fluctuate between 11d C and 4d C (24 hour period)
– nothing in Freezer has defrosted. I’m monitoring temp. in there but looks to be holding -18d C
– power / electrical usage seems normal at 0.8kWH over 24 hour period
– zero frost in cabinets/behind wall/panel etc (first thing I checked since we know what to look for when we had the ice problem 3 months ago).As I understand, there is only 1 thermistor (also known as “fridge evaporator sensor”?) in this model. It’s behind the panel that was removed 3 months ago (we got a 3rd party technician out to defrost). So my question is should I order: GENUINE MIELE FRIDGE FREEZER TEMPERATURE SENSOR REPAIR KIT FN K KDN KF KFN KWT and attempt to replace? (I don’t mind the electrical rewiring so much, I just don’t want to spent $ on the wrong part). I should’ve ordered a Liebherr, same parts… and I could do with a Service manual.
Muchly appreciated
BHi,
There are 3 sensors on that unit, 2 in the fridge and 1 in the freezer.
The evaporator sensor is foamed in, and is the sensor that will bring on the compressor and opens the solenoid valve to supply refrigerant to the fridge section.
The air sensor in the fridge will turn off the solenoid valve once temperature has been achieved.
Freezer is constantly fed with refrigerant, when the compressor is running.
Repair kit 9590084 is required for the fridge evaporator and repair kit 9590206 for the remaining 2 sensors.
These are Liebherr part numbers for the Liebherr equivalent model ( CN 3933 )
You have not given your index number, so I guessed at 164-20 but I would need this number to confirm the information I have provided is correct.
Regards,
Tony.Thanks for the response Tony,
I see where the index number is, mine is a: 164 21C. Are the parts you listed compatible?We’ve stopped using the “super freeze” function since we defrosted the fridge. But the other half turned it on a few hours ago and I noticed my thermometer in the freezer was past it’s rated -30d C (the needle was way past that, and everything was super cold, I assume it’s around -40d C or colder in the freezer. Isn’t the super freeze supposed to stop when the freezer reaches the set temperature on the panel?). Alas the fridge wasn’t affected, it remained between 7 and 9d C
Also, where is the 2 sensors in the fridge? I assume it’s in the panel where the fan is, do I just try and pry it open? (I do hate screwless panels with just clips!)
Thanks again
BHi B,
OK on that index, you have 4 sensors, 2 in each compartment. The super freeze function is time controlled ( 65 hours ) permanent on and sets the freezer to -38c.
It may be your evaporator sensor not allowing the solenoid valve to open and provide cooling to the fridge, it could also be a faulty solenoid valve not opening.
The air sensor is in the cover located on the left hand wall of the fridge, and as stated the evaporator sensor is foamed into the rear wall at the same level of the air sensor in the cover.
The sensors are compatable with your unit, freezer air, freezer evaporator, fridge air are 9590206. The fridge evaporator sensor is the 9590084 which comes with a new cover for the evaporator sensor and the original or new air sensor.
The solenoid valve if faulty, can only be checked in service mode by listening for an audible click, no electrical tests can be performed on it, and if failed will require an Engineer to replace and re gas the system.
Changing the fridge evaporator sensor will require access to the main pc board at the rear of the unit to the right of the compressor, not an easy job for a non qualified person.Ah poo. So, 4 sensors to check, and 1 solenoid. And even the fridge evaporator sensor requires access to the PCB? I saw a hack which cut the wire, throw away the old sensor part, attach the new sensor (cutting and stripping the wire) then ‘waterproofing’ it (where the wire was cut) with heat-shrink plastic – this avoids having to mess with connections to the PCB. But the solenoid is just a headache.
…that’s a lot of diagnostics, yes maybe I’ll start shopping around for a new (non Miele) fridge as plan b 🙁
Thanks
BThe kits 9590206 allow the cutting off of the sensor head and connecting the existing cable connected to the board by means of crimps and an insulated box, all supplied in the kit, the fridge evap sensor will need connecting to the rear of the PCB.
Very unlikely the compressor, send me your email and I will send you some more information. tonyrandall@live.co.uk
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