Unfortunately, I've never seen this error, so I can't give you much help beyond what the code means and the possible solutions that the service manual provides...
SC820:
Self diagnostic error: CPU - Unexpected external error or interrupt occurred.
• Controller board defective
• Software defective
The manual indicates this is a "C" type code, so this should not be displayed on the OP panel, only logged in the SC history in the machine.
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