Fridge Freezer will not maintain fridge temp, but freezer fine
My Miele KFN 8726SDED will not maintain the correct temperature in the upper refrigerator section.
The freezer section is fine, maintaining –20 degrees, but the fridge when set to 2 or 3 degrees warms up to 11 degrees. The “Super” refrigerant mode reduces the temperature down to 2 degrees, but once the “Super” feature is turned off the fridge warms up.
All vents are clear, there is no dust on the fins.
As the freezer section works fine and the fridge can, when prompted reduce the temp to 2 degrees then I assume that the compressor and associated cooling components are working correctly. If this was a bog standard fridge I’d assume it was the thermocouple and just install a new one, however this fridge freezer seems more complicated and cost a lot of money.
What is the likely fault and how do I fix it. I would class my abilities as above average DIY standard.
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The error code you are experiencing on your Miele KFN 12823 SD1 with four beeps and flashing of the super freeze LED, along with the 9 and 5 LEDs on the fridge temperature block, is indicating a problem with the fridge evaporator sensor. This sensor is responsible for monitoring the temperature inside the fridge compartment and is located in the fridge section.
According to the service manual, the evaporator sensor for your model is located inside the fridge compartment, behind the light unit and it can be accessed by removing the light cover. The sensor is connected to the main control board via a cable.
It's important to note that the location of the sensor can vary depending on the specific model. In your case, since the sensor seems not to be behind the light unit, it could be that it is foamed-in.
If you want to replace the sensor, you will need to carefully remove the foam insulation in order to access the sensor. This can be a delicate process and it's important to be careful not to damage the insulation, which can affect the cooling efficiency of the fridge.
It's recommended to have a professional technician to help you with the replacement, as it might involve handling with refrigerant and electrical connections.
It's also important to make sure that you have the correct replacement sensor for your model and to follow the instructions in the service manual to ensure a proper installation.
Usually due to a loss of coolant efficiency or a lack of Freon (or replacement coolant) and has to be checked and replaced. The other option is to replace the whole unit.
Not sure how the light socket only has 6V supply? The bulb for this fridge is a pretty standard 15 Watt/230V SES lamp. If you are sure the current lamp is OK I would suggest the door lamp switch has issues. Try pressing and releasing the door switch manually and check that it functions ok without getting stuck or any sluggish movement. This action in itself may fix the problem.
If the fridge part of your Zanussi ZX97/5SI fridge/freezer is no longer keeping cool, while the freezer part is still working fine, there could be a few possible causes:
Thermostat malfunction: The thermostat controls the temperature inside the fridge. If it is malfunctioning, it may not be able to maintain the correct temperature, causing the fridge to get warm.
Air circulation problem: If the air is not circulating properly inside the fridge, it may not be able to maintain the correct temperature. This could be caused by a dirty or blocked air vent, a malfunctioning fan motor, or a problem with the door seal.
Evaporator coils are iced up: The evaporator coils are responsible for removing heat from the fridge. If they become iced up, they will not be able to function properly, causing the fridge to get warm.
Compressor issue: The compressor is responsible for pumping refrigerant through the cooling system. If the compressor is not working properly, it may not be able to pump refrigerant through the system, causing the fridge to get warm.
A malfunctioning control board: The control board is responsible for managing the functions of the refrigerator, if it's malfunctioning it may cause the fridge not to maintain the correct temperature.
The compressor behind the fridge should cycle on and off as the machine maintains temperature, but the evaporator fan inside the freezer will keep running, except when the fridge goes into defrost. If the noise is coming from the fan inside the freezer, there could be some ice on the frame of the fan and the blades are touching the ice. If the noise is coming from behind the fridge it could be the condensor fan motor. This fan is situated behind the fridge in front of or next to the compressor. It keeps the condensor cool by blowing air onto it. Check this fan. The blades could be touching the pipework or something.
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