To properly measure the temperature in the refrigerator, put e.g. a jar of water and after 24 hours. measure the temperature in the water and you will be sure that the products have this temperature. You can move the jar to different shelves and assess where it is the coolest (it should be on the lower shelf). Measurement in air is very imprecise.
Similarly, you can measure the temperature in the freezer, remembering to use antifreeze liquid, e.g. denatured alcohol or ordinary vodka, instead of water.
As for the lamps in the CZ340 (only for the freezer):
- orange signals that the operation is super (the switch is turned on), the freezer works all the time! In normal operation, it should be off. ie the lamp is off.
- red indicates too high (too warm) temperature in the freezer. When the on temperature is reached, it should be off, which means it is OK.
-green should glow all the time, but knowing this model, after a few years it shines fainter and weaker, and finally it does not shine at all. The lamp has no effect on the operation of the freezer.