This is a large misconception of this unit. After a defrost cycle is completed, the display stays in "DEF" or "REC" until the box temp reaches 14 degrees of the "set" temp. So, if you have it set on zero, the conditioned space has to get to 14 degrees and then the display will switch over and show the temp. One way to verify this, is if the display shows DEF, check to see if the compressor is running, if so, then this scenario applies.
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