The reason it closes is to prevent warm air from entering the unit through the drain tube.
48+ How To Prevent Ice Buildup In Freezer
Images. Additional thoughts on the process of preventing ice build up in your freezer with copper. Thick ice build up but now i have manually defrosted.
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If you are getting a frost buildup on the inside of your freezer, you may have a damaged or defective lid or door gasket. Icing can prevent freezers from operating properly, causing compressors to work overtime in order to keep temperatures at ideal conditions. Over time, ice buildup between the bin and the freezer wall can push the bin out of alignment, tripping this sensor.
Each time you open the door, the cold air flows out and warm air creeps inside of the compartment.
There are a whole host of reasons, but simply put, frost and icing are bad because they cost money. Check the door gasket for tears, wear or age. The evaporator fan is particularly susceptible to this type of fault, with ice blockages preventing the fan from rotating properly. Defrosting a freezer is time consuming, messy and inconvenient.
