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Scantronic 9751 Expander01 Missing

UncleArthur
in Control Panels (Public)

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Two years ago my alarm went off and the control panel displayed the fault Expander01 missing. I reset the system OK but the same fault appeared a few days later. I opened up the various boxes and could not see an obvious cause. I again reset the system and it has worked fine until now. The Expander01 fault has reappeared. Can anyone suggest the most likely cause and what would be a good course of action? Thanks.

Recable it.

Is the jumper securly fitted for its address?

Is the Voltage more than 12vdc at the expander?

How old is the battery?

Should do for a start.

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