Does Kenmore Elite upright freezer reach -20 degrees celsius, where is the info?

Consult your owners manual but maybe it’s to designate Fahrenheit as opposed to Celsius

A flashing red light on a tall freezer indicates that the appliance has detected a temperature alarm, and the temperature inside the freezer has likely dropped below the desired range. A temperature of -6 degrees Celsius is much lower than the recommended temperature for a freezer (-18 degrees Celsius), which can cause frozen food to become damaged or spoiled.
To resolve the issue, you should first check the freezer's manual for troubleshooting tips and recommended actions. In general, you may need to adjust the thermostat to a higher temperature, remove any obstructions to airflow, or defrost the freezer if ice buildup is blocking the evaporator coils. If the issue persists, you should contact a qualified technician to diagnose and repair the freezer.

A bad temperature sensor? Or you have the temps set to read Celsius?

Service engeener always checks the average temperature inside freezer or refrigerator compartment. When you turn on freezer, the compressor starts to circulate gas through the system and the temperature in the freezer is decreasing (go to minus). When inside of the freezer reaches the set temperature the compressor is switched off and temperature will increasing. What will be the difference of inside temperature depends on the type of refrigerator and type of thermostat or sensor and moves to max. 8-9 degrees. With the advent of new "No Frost" refrigerator, this difference was reduced to only a few degrees Celsius, thanks to the fan inside the refrigerator and NTC sensor.
So 29 + 14 = 43; 43/2 = 21.5 which means that your average temperature of -21.5 which is not too much deviation from the set temperature of -18 and I think that is ok.

Dado

dear sir /madam
the ideal freezer temperature is 0 fahrenheit(-18 celsius) for storing food. and - 10 fahrenheit (-23 celsius) is recommend when freezing food.
and generally 3 to 5 celsius (37 to 41 fahrenheit) is ideal for refrigerator

hope answer the question
thank you
please vote!

you may check the internal fan, ran into that same problem tried cleaning the coils and ended up being the fan

alarm should go off when freezer reaches minus 18c or lower.

If all is ideal maybe -10 an occationally -15 and this is F considerable coolder than -20C. ALSO fyi a chest freezer will stay at or below these temps better than an upright and especially a self defrosting model. Because a chest freezer you dont loose all the cold air when you open the door. TYhey are not made in auto matic defrost as far as I know (never have seen one but then I havent been looking for one either. An up right freezer can be manual defrost or automatic. but the cold air falls ouit every time the door is opened.

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Hi dgh1,
The freezer should stay within 5 degrees of 0 while in operation. While in defrost the freezer may reach as high as 20 to 25 degrees. If any higher temperatures are reached your food will spoil as they are defrosted and refroze everyday. If you find that the temperature is allowing your food to defrost you may want to replace your defrost thermostat. This device is located on top of the evaperator coil inside the back of the freezer. It is made to turn the heater off when a temperature of 55 degrees is reached. One other possible problem could be your defrost timer is taking to long to restart the cooling cycle after defrosting. I hope this will help you and please send any other questions you may have, I am happy to help. and dont forget to rate me.
Mike Anderson
Anderson Appliance
(865)945-3808