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Jim, Pc Er is a Communication circuit failure on main board or
Communication circuit failure on control panel board
Could be a loose or corroded connection, a bad mother board or a bad display board. Before doing anything, unplug the refrigerator for 5 min and plug it back in. This may reset the motherboard. If not, check the comm cable at the display and the motherboard. if ok, then you will need to replace either the motherboard or the display board. There is no way of determining which one to replace.
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