| AF | High Temperature Fault | Ambient temperature is too high; cooling fan has failed (if equipped). | Shutdown | Check ambient temperature and cooling fan. |
| CF | Control Fault | A blank EPM, or an EPM with corrupted data has been installed. | Shutdown | Perform a factory reset using Parameter 48 - PROGRAM SELECTION. |
| dF | Dynamic Braking Fault | The drive has sensed that the dynamic braking resistors are overheating and shuts down to protect the resistors. | Shutdown | |
| EF | External Fault | TB-13A and/or TB-13C is set as an External Fault input and TB-13A and/or TB-13C is open with respect to TB-2. | Shutdown | Refer to Parameter 10 and/or 12. |
| F1 | EPM Fault | The EPM is missing or damaged. | Shutdown | |
| F2-F9, Fo | Internal Faults | The control board has sensed a problem. | Shutdown | Consult factory. |
| FL | Follower Lost | If a 4-20 mA signal is used as a speed reference, PI setpoint reference, or PI feedback, and the signal drops below 2 mA, the drive will trip and display FL. | Shutdown | |
| GF | Data Fault | User data and OEM defaults in the EPM are corrupted. | Shutdown | Refer to Section 13.2. |
| HF | High DC Bus Voltage Fault | Line voltage is too high; deceleration rate is too fast; overhauling load. For fast deceleration or overhauling loads, dynamic braking may be required. | Shutdown | Consider dynamic braking for fast deceleration or overhauling loads. |
| JF | Serial Fault | The watchdog timer has timed out, indicating that the serial link has been lost. | Shutdown | |
| LC | Fault Lockout | The drive has failed three restart attempts and now requires a manual reset. | Shutdown | Perform manual reset as described in Section 16.0. |
| LF | Low DC Bus Voltage Fault | Line voltage is too low. | Shutdown | |
| OF | Output Transistor Fault | Phase to phase or phase to ground short circuit on the output; failed output transistor; boost settings are too high; acceleration rate is too fast. | Shutdown | |
| PF | Current Overload Fault | VFD is undersized for the application; mechanical problem with the driven equipment. | Shutdown | |
| SF | Single-phase Fault | Single-phase input power has been applied to a three-phase drive. | Shutdown | |
| UF | Start Fault | Start command was present when the drive was powered up. Must wait 2 seconds after power-up to apply Start command if START METHOD is set to NORMAL. | Shutdown | Wait 2 seconds after power-up before applying Start command when START METHOD is NORMAL. |