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Because the evap coil will buildup frost which will insulate the coil from the fridge and make it warmer.
Sorry, there was a problem. Please try again later.Refrigerator units usually use a heating element to defrost their evaporators, a pan to collect and evaporate water from the frost that melts from the cold plate and/or evaporator coil, a timer which turns off the compressor and turns on the defrost element usually from once to 4 times a day
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