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Sounds like you need to do a 12 hour defrost. If the evaporator is caked with ice, the thermistor(temp.probe.) will also be covered. the true temp wont be read in this state. Defrost and then retry. Take note of temp for a period of time. See if it ever goes to -20 as selected. If so then at a later date it goes off again, there is then a defrost issue. Suspect the door was left open accidentally.
If the door seals are still pliable and intact there are two possible causes.
1/ The upper door hinge on the top of freezer unit has two adjusting screws under a plastic cover/cap which allows the upper hinge to be set forward or back altering/adjusting the spacing of the door seal to the freezer body. Moving the hinge outward at the top will cause the door to seal tighter at the bottom and lessen escaping cold air and condensation to form (water droplets). Adjust carefully so as not to create a weak seal (air gap) along other sealing edges of the door frame.
2/ Many United Refrigeration Commercial Freezers are manual defrosting. Moisture from inside the freezer can condense between the inner molded door panel (door shelves) and the exterior metal door. Usually ice buildup will occur in this space, but when defrosting or during high ambient temps the ice will melt and drip out along the bottom door edge/seal. Screws alomg the door frame (hidden by the door seal) hold the seal in place and also the inner molded door panel. The inner panel can be removed to replace the seal or to remove the ice buildup.