I have a Kenmore 25 cu ft chest freezer, it seems to have two problems. Let me first say I have 11 of these, and an independent temperature monitoring system. The temps generally run -11* to -22* F. It depends on whether the sensor is against the wall or in air. The independent sensors are on the end of a wire and hang were the hang. If against the wall it will read the -22* F or even colder. It has temperature display that started reading incorrect and blinking. It also runs warmer than the others at maybe -5*F. I tried placing the sensor against the wall and the temp did drop to -10*F. This may seem cold enough but if the others run at -22* when the sensor is against the wall so should this one. So far I replaced a control pcb, and that solved the blinking display and incorrect temperature, or at least the temperature reads much lower now than it did.
If the freon was only a little low, would that cause the evaporator tube temperature in the wall to increase from -22* to -10*?
Mikek