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What are the possible causes and remedies for Err4 on ATV212 or ATV21 Drives?

Issue:
What are the possible causes and remedies for Err4 on ATV212 or ATV21 Drives?

Product Line:
ATV212, ATV21, S-Flex

Environment:
All

Cause:
NA

Resolution:
It is a Main Control Board CPU Error. The Control Board CPU is inoperable. Disconnect Control wire(s) from P24 and PP terminals. Cycle power to the drive. If problem persists, try to reset the drive using tyP parameter. If VFD will not allow any parameter change then replace the VFD.
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