F0084 fault in WEG CFW701 Drive indicates an Auto-Diagnosis Fault. This means the drive’s internal power-on self-test detected a hardware malfunction or incompatible firmware components.
Cause:
- Defect in the inverter internal circuitry.
- Firmware incompatible with an accessory.
Remedy:
Verify internal control board and power pack connections. Update control unit firmware if needed. Contact technical support if a hardware defect is suspected.
