Kinetix 300/350 fault codes: E39, E09, F 33, Sc05, nF01

The Kinetix 300 shows faults as E plus two digits (E09, E39…); the Kinetix 350 shows S, F, Fc, Ic and nF codes on its four-digit display. Common codes, status indicators, STO faults, what to check and how to clear faults safely.

Kinetix 300 and Kinetix 350 drives (Bulletin 2097) report faults differently. The Kinetix 300 (indexing drive, configured with MotionView OnBoard) shows E plus a two-digit code on its display, for example E09 or E39 (2097-UM001F, p. 155). The Kinetix 350 (Integrated Motion on EtherNet/IP, configured in Logix Designer) scrolls a code on its four-digit display; the prefix gives the group: S/Sc start inhibit, F/Fc axis fault, Ic initialization, nF node (whole drive), L/P boot and self-test errors (2097-UM002E, pp. 112–113). The same DC bus undervoltage is E09 on one and F 33 on the other. Sources: the two Rockwell Automation user manuals (12/2022).

Where to read the fault

Kinetix 300

On a fault the display shows the code; after 30 seconds without keypad activity it alternates the IP address and the code. Normal status is diS (disabled) or run (enabled) (p. 154).
With the push buttons (Table 65, p. 124): FLtS scrolls the stored fault history (E0XX…E7XX, XX = fault code), buS shows DC bus voltage, Ht heatsink temperature.
The red "Drive fault" indicator (D) lights on a drive fault; green "Comm activity" (E) flashes with communication (Figure 76, p. 125).
In MotionView, "Faults" category: "Load Faults" recalls the last 15 faults, "Clear Faults" clears the present one (Table 54, p. 98).

Kinetix 350

Display	Meaning	Priority
-08-, -00- … -04-	Self-test, waiting for controller connection (-00-), configuring (-01-), group sync (-02-), DC bus charging (-03-), operational (-04-)	4
S xx / Scxx	Start inhibit (drive cannot enable)	3
F xx / Fcxx	Axis fault	2
Icxx, nFxx, Lxxx, Pxxx	Initialization, node, boot, power-on self-test	1 (highest)

Source: Tables 43–44, pp. 112–113. Only the higher-priority message is shown.

Indicator	State	Meaning
Drive (M)	Flashing / steady red	Recoverable fault / non-recoverable major fault
Axis (A)	Flashing yellow	Start inhibit, or shutdown with bus up
Network (N)	Flashing green	No connection
Network (N)	Flashing red	Connection timeout or recoverable minor fault
Network (N)	Steady red	Duplicate IP or major fault

Source: Tables 52–54, pp. 120–121. Typing the drive IP into a browser opens a basic web page with a Fault Page; nothing is configurable there (p. 128).

Common Kinetix 300 codes

Code	Name in manual	Cause per manual	Check
E04	Motor overtemperature	Motor thermostat: high ambient, excessive current	Continuous torque rating, cooling, wiring, motor selected
E07	Feedback lost	Feedback wiring open, shorted, missing	Encoder wiring, motor recognized
E09	Bus undervoltage	Low AC input	AC voltage, line drop; UPS
E10	Bus overvoltage	Excessive regeneration; high AC input	Decel profile, resistive shunt and its wiring
E11	Illegal Hall state	Phasing, bad connections	Hall wiring, 5V encoder supply
E14	Ethernet I/O connection lost	Ethernet I/O connection lost	Cables, routing, RPI in the controller program
E19	Excess position error	Position error limit exceeded	Following error limit/time, position loop tuning
E23	Drive Thermal Protection	Drive thermal algorithm tripped	Acceleration, duty cycle, drive size
E39	Safe Torque Off while enabled	Safety circuit opened while enabled or enabling	See STO below
E43	Drive enable input	Hardware Drive Enable inactive during software enable	Drive Enable input wiring
E44	Controller changed to PROG mode	Download or key switch to PROG	Controller to RUN, clear faults
E72	Drive temperature too high	Airflow or ambient	Vents, fan, clearance, enclosure temperature
E74	Drive has exceeded peak current limit	Shorted cable or winding, RMS overload, failed drive	See hardware section
E91	User watchdog has timed out	WatchDogKick tag not written often enough	Timeout value, kick rate
E92	Bad battery	Tamagawa absolute feedback battery low/missing	Replace battery

Source: Table 72, pp. 155–157.

Common Kinetix 350 codes

Code	Name in manual	Cause per manual	Check
S 01	Axis enable input	Axis Enable input not active	Wiring, 24V source
Sc05	Safe torque off	Safety function disabled the power structure	24V to safety circuit
F 05	Motor Overtemperature	High ambient or excessive current	MF connector, TS+ and COM wiring
F 07	Motor Thermal Protection	Motor thermal model above 110%	Lower speed or longer move time
F 10	Inverter Overcurrent	Shorted cable or winding, drive too hot, TTL signal loss	Winding resistance, AM+/AM-/BM+/BM-
F 11	Inverter Overtemperature	Fan failed, cabinet hot, airflow blocked	Cabinet temperature, airflow
F 33	Bus Undervoltage	Bus below 275V (460V system), 137V (230V), 80V (120V)	AC voltage, line drop; UPS
F 35	Bus Overvoltage	Excessive regeneration	Decel profile, shunt resistor
F 43	Feedback Loss	Feedback wiring open/shorted, noise	Wiring, shielding, grounds, Hookup test
F 54 / F 55	Excessive Position / Velocity Error	Partial feedback loss, sizing, mechanics	MF connector, tuning, mechanics
F 61	Drive Enable Input	Enable input dropped while enabled	Wiring, 24V source
Fc 05 / Fc 06	Motor Encoder Battery Loss / Low	Weak battery or poor connection	Replace battery
nF 01	Control Update Fault	Excessive network traffic, noise	Fewer devices, topology, wiring separation
nF06	Control Connection Loss Fault	Motion connection timed out	No action given; advice: cable, switch, N indicator

Source: Tables 45–51, pp. 114–119; nF06: Table 60, p. 127. For F 43, attribute #2703 (read with MSG Get Attribute Single) gives the reason (p. 116). A TTL encoder losing A/B is not detected directly and usually appears as F 54 or F 55; in some cases, particularly in Torque mode, no fault is raised: the motor coasts to a stop while the axis is still enabled in Logix Designer (p. 124).

Memory module: E76 (blank module) on both drives, cleared by holding the enter key until "bUSY" to format it; a bad module is E70 on the Kinetix 300 and E38 on the Kinetix 350 (2097-UM001F pp. 156–157; 2097-UM002E p. 113).

STO faults

Kinetix 300: E39 appears on enable when STO-4 and STO-6 disagree, and also when both are de-energized (STO function engaged) (Table 73, p. 163). For a mismatch, the causes listed are: loose STO wiring, header not seated, missing +24V. Reset, then run the proof test; if it persists, return the drive to Rockwell Automation (p. 164).
Kinetix 350: an active STO posts start inhibit Sc05; a proof test is required after troubleshooting (p. 101).

Check sequence

Record the code, indicators and fault history before resetting.
Power codes (E09, E10, F 33, F 35): read buS, measure the AC input.
Network codes (E14, nF 01, nF06): cable, switch port, N indicator.
Feedback and motion codes: wiring, shielding, grounding, the configured motor, then mechanics and tuning.

Clearing faults safely

Clearing a servo fault can restart motion. Follow the plant's lockout and permit rules.

Kinetix 300 (pp. 158–159): a digital input configured as "Fault Reset" in MotionView; an explicit message to Class 374 (hex) Instance 53, Attribute 0 (write 1, then 0); or cycling the enable command when fault reset is set to "On Disable".
Kinetix 350: the reaction to each exception is set in Axis Properties, "Actions" category; a Shutdown action needs a "Shutdown Reset" (Table 57, p. 124). Some faults need two reset commands (p. 121).

When it is hardware

E74 / F 10: with all power and motor leads removed, check continuity from the DC bus to U, V, W; if present and no stray wire fibers are found, send the drive for repair (2097-UM001F p. 156; 2097-UM002E p. 115).
Kinetix 350: Lxxx: reload firmware and restart, return the drive if it repeats; Pxxx: return the drive (p. 118). Fc 14: replace the drive (p. 117).

Before calling support, record the catalog number, the Fx.xx firmware shown on the display, the code and what the machine was doing. Need an engineer on site: request support. For replacement options see Kinetix 300/350 migration; newer drives: Kinetix 5300 fault codes.

Frequently asked questions

What is error E39 on a Kinetix 300?

E39 "Safe Torque Off while enabled" means the safety circuit opened while the drive was enabled or enabling; an STO-4/STO-6 mismatch also gives E39 (2097-UM001F pp. 156, 163). Check STO wiring and +24V, reset, run the proof test, and return the drive if it persists (p. 164).

What does Sc05 mean on a Kinetix 350?

Sc05 is the "Safe torque off" start inhibit: the safety function has disabled the power structure (2097-UM002E p. 114). Check the 24V supply to the safety circuit and run a proof test afterwards (p. 101).

What should I check for E09 or F 33 bus undervoltage?

Measure the AC input and look for line drop; the manuals suggest a UPS. On the Kinetix 350 the limit is a bus below 275V for a 460V system (2097-UM002E p. 115).

How do I clear a fault on a Kinetix 300?

Use a "Fault Reset" digital input, an explicit message to Class 374 (hex) Instance 53, Attribute 0, or cycle the enable with fault reset set to "On Disable" (2097-UM001F pp. 158–159). Clearing a fault can restart motion.

Sources

Rockwell Automation, 2097-UM001F-EN-P, Kinetix 300 EtherNet/IP Indexing Servo Drives User Manual, 12/2022 — pp. 98, 124–125, 154–159, 163–164
Rockwell Automation, 2097-UM002E-EN-P, Kinetix 350 Single-axis EtherNet/IP Servo Drives User Manual, 12/2022 — pp. 101, 112–128

Read 8 November 2026. This article paraphrases the sources and does not quote them; read the original documents before designing or working on a system.