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Contact the manufacture, it is most likely going to be covered under warranty. If the knob is not removable, (check for a set screw on the side of the knob it will take a small allen wrench) Then the thermostat (temp controller) will need to be replaced, if it isn't a style that you can calibrate.
These machines do not work like you think. The display will show the defrost mode even when in the freeze cycle. After a defrost cycle, the cooling system comes on but the display will not show any temperature numbers until the conditioned space gets to within 15 degrees of where you have it set to cool to. So, if it is set to 0, the box needs to hit 15 degrees before it shows numbers. You have a cooling problem. Several thing can cause this. may need a tech to check.
This is normal. All commercfial freezers must defrost 3 to 5 times a day, or they will freeze over at the coil and then stop freezing. A timer in your freezer turns off the compressor and turns a heating element on for 10 to 15 minutes. During that time the coil heats and melts frost from the coil. Usually within 30 minutes the temperature will briefly rise to 20 t0 25 degrees F and then quickly drop down to 0 degrees F. The food rarely defrosts in this short period of time..
If this unit has a control it would be located on the outer left side in the lower right hand corner. There would be a dial, the higher the number the cooler the temperature. Many of these chest freezers did not have an adjustable control.
It seems to me that the thermostat is no longer sensing temperature. IT will either stay on (it controls the compressor) or wont come on at all when it becomes a problem. You can order one thru sears.com if there is not a appliance parts store nearby. To check before buying, heres what you do. You need to know the temperature (use a thermometer that reads below zero). it has to be at least 10 degrees or cooler. if it is then turn down thermostat dial to 1. if it shuts off then the thermostat is ok. if it doesnt turn off (the compressor) replace t'stat. let me know the temp. and if this works for you hope this was helpful...
Not sure of your make/model. If its a standalone freezer you could exchange the termostat with a Fridge, or you could jury rig a seperate line voltage thermostat with probe in the compartment, which you would plug the fridge into and would override the internal thermostat (internal thermostat would always be calling for cooling because the line voltage thermostat would be set higher--any time the temp increased above the set point on the line voltage tstat the relay would close and the freezer would run). An anti freeze alarm coupled to a simple relay or contactor would work for this purpose... depending on how handy you are I could explain all the necessary components...