One of the main causes of walk in freezer temperatures to rise is when air flow across the evaporator is diminished or stopped completely. This doesn't allow the heat to transfer to the refrigerant and thus the coils begin to frost over. If not monitored the entire coil becomes an ice cube.
Is Your Freezer Freezing Up
![Is Your Freezer Freezing Up](https://prorefrigerate.com/wp-content/uploads/2020/01/Freezer_Freezing_Up-200x150.png)
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