Hello;
My name is Peter. I am a retired field service refrigeration technician.
I am going to assume your compressor and condenser fan is running. Your condenser fan is in the lower back of your freezer.
You will need to remove the back cover in your freezer. There are 6 screws holding it on.
Check the following (Cover Removed):
1.) Frozen Drain - Your freezer goes into a defrost mode every 8-10 hours, where your freezer shuts down except for the lights, and your defrost heater turns on for about 20-30 minutes to defrost your cooling coil. If you have a frozen drain, the condensate builds up behind the back wall and icing the cooling coil, restricting air flow. You must defrost the coil.
2.) Freezer Fan Motor Failure - Having removed the back wall observe if the freezer fan motor is running. If not replace.
3.) Refrigerant Restriction or Leak - If you observe a large build-up of ice in the upper right hand corner, then you have a restriction or leak. The cost of repair would be about $400.00
4.) Bad Thermostat - In the upper right hand corner of you cooling coil, attached is your thermostat. They can explode, where the back of the thermostat will raise up.
You can also check it with a multi-meter, set to the lowest Ohms (Omega Symbol). You need to cut the wires, leaving enough wire length to rewire back in. Put the thermostat in a glass of ice water for 10 minutes. After, it should Ohm out around 16. It is reads '0' or infinity it is bad. Below 15 or 16 it is bad
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