Intelicenter mother board

That is correct. It is meant to be installed as Expansion 1-3. There is not an expansion board that has temp sensors. In fact it won't respond until the main board sends it a message. Did wherever you bought this sell it to you as an expansion or as main controller.
 
Pentair 523051 that is the part number that I ordered

You needed 523050.

You got what you ordered which is the i5X board.

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