Code Name Causes Possible Solutions SE Modbus Test Mode Error MEMOBUS/Modbus communications self-diagnostics [H1-xx = 67] was done while the drive was running. Stop the drive and do MEMOBUS/Modbus communications self-diagnostics. Note: If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.