Cause : Board mismatch comes when the combination of the inverter and its circuit board is not appropriate, or when the circuit board with the control circuit terminal block is not connected to the inverter.

1. Check that the circuit board with the control circuit terminal block is connected to the inverter.
2. Connect the circuit board with the control circuit terminal block to the inverter. (Tightening torque when the circuit board is connected to the inverter: 0.7 N·m)