You need not worry about the defrost cycle. It just warms the external walls of the refrigirator and in the interior it will be about 20-25°C which i guess will be good enough to store vaccines. There is a work around to remove the deffrost thing but if defroster or the fan on the evaporater(inside coil)when the evaporater does not defrost it causes ice build up on it,this does not allow air to flow through it.The result of this is that the freezer will stay cold for awhile but the refrigerator section will not get cold enough.
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