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How do I fix an F54 (Slot Communication Fault) code for a 9000X Series drive?

A slot communication fault occurs when the main control board cannot communicate with one of the boards that are plugged into it. In the fault history under the sub-module it should tell you what slot it is not seeing. The easiest way to troubleshoot this problem is to take the board out of this slot and install a different board. If you do not have another board to try this, most boards can be put into more than one slot. Switch the board in question to another slot, if the problem moves with the board you have a bad board that will need to be changed. If the problem stays with the slot the control board is bad. To temporarily get up and running, if you have an open slot that the board can be put into, move the board. Sometimes this fault can’t be cleared whether there is a board in the slot or not, in this case the only real option is to replace the control board.