What is does the Error Code 00020001 mean on PM800 Meter?

The error code 00020001 Corresponds to register 3050 and 3051

3050 = 0001
3051 = 0002

From the register map this maps out to:

3050 = 0000 0000 0000 0001 = Error
3050 = 0000 0000 0000 0010 = tbd Option Slot A module failure

Looking at the code it appears the issue is related to IO, I would start there.

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