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When I open my pool I always put a chlorine floater in until the water gets warm enough for the Pentair IC40 to take control. Also, the cold water light was on on the IC40 unit hence the reason I put the floater in. As of the last two weeks I noticed the cold water light off so I pulled the...

It indeed seems as though I lost the COM port on my Pentair 520076 board. If I go and replace this board does the system need to be reprogrammed or is everything stored on the motherboard? Also, does anyone know if the board 520265 is the replacement for 520076? I can only find the part #...