Hi.
The back of the freezer icing up means that there is a problem with the defrost system. When the defrost system is not working the evaporator coils
freeze up , resulting in compressor and fan running most
of the time and in reduced or no cooling as the condenser goes under stress and the system loses efficiency.
Defrost system problems are quite a common issue with refrigerators. Coils freeze because of a defective defrost system.
With coils frozen the condenser will go under stress and will loose
efficiency. The result is the system not producing enough cold to
refrigerate the fresh food section while the freezer section instead
keeps working.
Try disconnecting power overnight.
Allow the freezer to defrost with
power off. If the fridge works after that you have a defective defrost
system. In that case the problem may come back after a couple of days.
To fix the problem the parts comprised in defrost system must be tested,
so to find and replace the defective part.
The defrost system comprises
defrost thermostat, heater, defrost control and fan. The parts that
fail more commonly are thermostat and heater. Both parts are located
behind freezer firewall and tested reading impedance with a multimeter. Element and thermostat are faulty if they return Ohms infinity (the circuit is open) when reading impedance with a multimeter at the part's contact.
If
thermostat and element are OK, the next part to be tested is the fan.
Fan can be tested by simply checking that the motor is running when
energized.
Here a tip explaining how to deal with a similar problem on a different fridge model: Fridge not cooling. Procedure is similar with your model.
You can find parts and diagrams for most appliances using the links listed on this page: Where do I find parts and diagrams for my appliance?
Regards.
Ginko
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