In walk-in freezer, What is the reason of TXV icing up? TXV body, sensing bulb and peripherals usually covered with thick and hard ice. At this time the box temp is not normal or takes very long time to pull down to normal temp. After melting the ice block, it takes only a week to find the same ice block around TXV. I am suspecious there is something wrong with TXV. Any idea? The walk-in freezer has been in service almost a year and this problem is happening from abt a month ago.