Yaskawa U1000 iQpump Drive

Yaskawa U1000 iQpump Drive Fault Codes:

Fault Code and Meaning	Cause and Remedy
ACCUM Accum Level Accumulated Level Fault: The total volume of water flow measured over time by the flow meter has exceeded the fault level setting.	Cause: The accumulated level has exceeded the values set in P6-11 to P6-14. This is only effective when P6-15 (Accumulated Behavior) is set to 2 (fault with manual monitor reset) or 3 (fault with automatic monitor reset). Remedy: Set the Accumulated Level fault characteristics in P6-11 to P6-14 and P6-16. Drive response to this condition is controlled by P6-15, Accumulated Behavior. Auto-restart of this fault is controlled by P6-15 and P6-05, Flow Accumulation Reset.
AJF Anti-Jam Fault Anti-Jam Fault	Cause: The drive was not able to clear debris from the impeller in fewer than the number of attempts set in P7-02. This is only effective when P7-01, Anti-jam Operation is set to 1 (enabled). Remedy: Check for proper pump operation. Remove debris from the pump impeller. Set the Anti-jam fault characteristics in P7-02 to P7-08. Drive response to this condition is controlled by P7-01, Anti-jam Operation Selection.
Aov Power Supply Overvoltage The input power supply voltage became equal to or higher than the Input Power Supply Overvoltage Detection Level. 200 V Class: approx 277 Vrms 400 V Class: approx 630 Vrms	Cause: The power supply voltage exceeded the range listed in drive input power specifications, regenerative operation was performed when capacity was too small, or the power supply circuit opened during regeneration. Remedy: Reduce the voltage to within the range in the power supply specifications. Increase the capacity of the power supply.
AUv Power Supply Undervoltage The input power supply voltage became equal to or lower than the Input Power Supply Undervoltage Detection Level (L2-21).	Cause: The capacity of the power supply is too small, distortion is too large, a phase loss occurred, or the built-in fuse is open (internal transistor destroyed). Remedy: Increase the capacity of the power supply. Lower the impedance of the input power supply wiring. Check the input power supply for phase loss or an imbalance in the interphase voltages. Investigate and correct cause. If the built-in fuse is open, the input/output wiring may be grounded or short circuited. Replace the board or drive. Contact Yaskawa.
AUXFB PI Aux Lvl Loss Wire-break detection for PI Aux Feedback Level	Cause: The analog input programmed for “PI Aux FB Level” has dropped below 3 mA or risen above 21 mA for longer than 1 second. Remedy: Repair transducer or wiring.
bAT Keypad Battery Voltage Low	Cause: The keypad battery is low. Remedy: Replace the keypad battery.
boL Braking Transistor Overload Fault The braking transistor reached its overload level.	Cause: The wrong braking resistor is installed. Remedy: Select the correct braking resistor.
bUS Option Communication Error Connection lost after establishing communication or detected when run command frequency reference is assigned to option card.	Cause: No signal from PLC, faulty communications wiring, existing short circuit, noise, or damaged option card. Remedy: Check for faulty wiring. Correct the wiring. Check for disconnected cables and short circuits and repair as needed. Check various options to minimize noise effects. Counteract noise in control/main circuit and ground wiring. Ensure other equipment (switches/relays) do not cause noise. Use surge absorbers. Use recommended shielded cables. Ground the shield properly. Separate communication wiring from drive power lines. Install EMC noise filter. Replace the option card if wiring is correct but error continues. Reinstall option card if connector pins do not line up properly.
CE MEMOBUS/Modbus Communication Error Control data was not received for the CE detection time set to H5-09.	Cause: Faulty communications wiring, existing short circuit, or communication data error due to noise. Remedy: Check for faulty wiring. Correct the wiring. Check for disconnected cables and short circuits and repair as needed. Minimize noise effects. Counteract noise in control/main circuit and ground wiring. Use recommended shielded cables and ground properly. Ensure other equipment does not cause noise. Use surge suppressors if required. Separate communication wiring from drive power lines. Install EMC noise filter.
CF Control Fault Torque limit reached continuously for 3 seconds after Stop command in OLV Control.	Cause: Motor parameters set improperly, torque limit too low, or load inertia is too big. Remedy: Check the motor parameter settings and repeat Auto-Tuning. Set the torque limit to the most appropriate setting (L7-01 through L7-04). Adjust the deceleration time (C1-02, C1-04, C1-06). Set the frequency to the minimum value and interrupt the Run command when the drive finishes decelerating.
CoF Current Offset Fault Drive starts operation while current-detection circuit failure or induced voltage remains in motor.	Cause: The drive performed a current offset adjustment while the motor was rotating, or hardware problem. Remedy: The set value exceeds the allowable setting range while the drive automatically adjusts the current offset. Set b3-01 to 1 to enable Speed Search at Start. Perform Speed Search 1 or 2 (H1-xx = 61 or 62) via external terminals. If problem continues, replace control board or entire drive.
CPF00 to CPF45 Control Circuit Error (Includes CPF00-CPF03, CPF07-08, CPF11-14, CPF16-24, CPF26-35, CPF40-45)	Cause: Hardware is damaged or connector on the keypad is damaged. Remedy: Cycle power to the drive. If the problem continues, replace either the control board or the entire drive. Contact Yaskawa. Replace the keypad if connector is damaged.
CPF06 EEPROM Memory Data Error Error in the data saved to EEPROM.	Cause: There is an error in EEPROM control circuit or power supply was switched off while parameters were being saved. Remedy: Turn off power and check connection between control board and drive. If problem continues, replace control board or entire drive. Reinitialize the drive (A1-03 = 2220, 3330).
CPF25 Terminal Board Not Connected	Cause: Terminal board is not connected correctly. Remedy: Reconnect the terminal board to the connector on the drive, then cycle the power to the drive.
DIFF Differential Det Differential Feedback Detected	Cause: The difference between the PID Feedback and the Differential Feedback exceeded the P4-18 level for the time set in P4-19. Remedy: Replace the feedback transducer or transducers. Verify parameter settings P4-18 to P4-20.
doH Damping Resistor Overheat Temperature of built-in damping resistor exceeded set value.	Cause: Power supply capacity too small, distortion too large, or phase loss occurred. Remedy: Increase the capacity of the power supply. Lower the impedance of the input power supply wiring. Check input power supply for phase loss or imbalance in interphase voltages.
E5 SI-T3 Watchdog Timer Error The watchdog timed out.	Cause: Data has not been received from the PLC. Remedy: Execute DISCONNECT or ALM_CLR, then issue a CONNECT or SYNC_SET command. Refer to SI-T3 Option Technical Manual for troubleshooting.
EF0 Option Card External Fault An external fault condition is present.	Cause: An external fault was received from the PLC and F6-03 is not 3, or problem with PLC program. Remedy: Remove the cause of the external fault. Remove the external fault input from the PLC. Check the PLC program and correct problems.
EF1 to EF8 Pump Fault (Input Terminals S1-S8) External fault at multi-function input terminal.	Cause: An external device tripped an alarm function, wiring is incorrect, or multi-function contact input setting is incorrect. Remedy: Remove the cause of the external fault and reset the fault. Properly connect signal lines to terminals assigned for pump fault detection. Check for unused terminals set for Pump Fault. Change terminal settings.
Err EEPROM Write Error Data cannot be written to the EEPROM.	Cause: Noise corrupted data while writing, or hardware problem. Remedy: Press “ENTER” on the keypad. Correct the parameter setting. Cycle power to the drive. If problem continues, replace control board or entire drive.
FAn Internal Fan Fault Fan or magnetic contactor failure.	Cause: Internal cooling fan malfunctioned, or fault detected in internal cooling fan or magnetic contactor to power supply. Remedy: Cycle power to the drive. Check fan operation. Verify cumulative operation time (U4-03) and maintenance timer (U4-04). If fan exceeded life or is damaged, replace it. If fault continues, replace power board/gate drive board or entire drive.
FbL PID Feedback Loss PID feedback level is below detection level set to b5-13.	Cause: Parameters set inappropriately, incorrect PID feedback wiring, or problem with feedback sensor. Remedy: Check b5-13 and b5-14 settings. Correct the wiring. Check sensor on control side. Replace if damaged.
FDBKL Wire Break PID Feedback Loss Analog input programmed for PID feedback has risen above 21 mA or fallen below 3 mA.	Cause: The analog input programmed for PID feedback loss has risen above 21 mA or fallen below 3 mA. Remedy: Confirm that the PID feedback source is installed and working properly. Drive response controlled by b5-12 and b5-13. Auto-restart controlled by L5-42.
Fdv Power Supply Frequency Fault Input power supply frequency exceeded allowable fluctuation.	Cause: Momentary power loss, loose wiring, large voltage fluctuation, or built-in fuse open. Remedy: Reset the fault. Check for loose terminals. Increase the power supply frequency fault detection width (L2-27). If fuse is open, replace control board or entire drive.
GF Ground Fault A current short to ground exceeded 50% of rated current on the output side of the drive.	Cause: Motor insulation is damaged; A damaged motor cable is creating a short circuit; Excessive leakage current at drive output; Hardware problem. Remedy: Check the insulation resistance of the motor. Replace the motor. Check the motor cable and remove the short circuit. Check the resistance between the cable and the ground terminal. Reduce the carrier frequency or stray capacitance. Set b3-01 to 1 to enable Speed Search at Start. If hardware problem: Replace the control board or the entire drive.
HFB High Feedback	Cause: The feedback signal is too high (risen above level set in P1-11 for time set in P1-12). Remedy: Set the High Feedback fault characteristics in P1-11 and P1-12. Check P1-13 (High Feedback Selection). Check L5-41 (High Feedback Fault Retry Selection).
HIAUX High PI Auxiliary Feedback Level	Cause: PI Aux Feedback has risen above the Q6-12 level for longer than Q6-13 time. Remedy: Lower the PI Aux Feedback level. Adjust parameters Q6-12 and Q6-13.
HIFLO High Flow	Cause: The meter has detected a high flow condition (risen above P6-17 level for time set in P6-18). Remedy: Reduce the flow. Set the High Flow fault characteristics in P6-17 and P6-18. Check P6-19 (High Flow Select) for drive response and auto-restart settings.
HISUC High Suction Pressure	Cause: The suction pressure has fallen below the level set in Q5-12 for longer than the time set in Q5-13. Remedy: Reduce the system pressure. Set the High Suction Pressure fault characteristics in Q5-12, Q5-13, and Q5-18. Check Q5-14 regarding drive response and auto-restart settings.
HWL High Water Level	Cause: The “High Water Level” digital input is active (H1-xx = 90); Low Water Level switch activated or P1-31 programmed incorrectly. Remedy: Lower the water level. Adjust the High Water Level switch.
LF Output Phase Loss	Cause: Output cable disconnected; Motor winding damaged; Output terminal loose; Rated current of motor is less than 5% of drive rated current; Output transistor damaged. Remedy: Check for wiring errors and properly connect the output cable. Check resistance between motor lines; replace motor if winding is damaged. Apply tightening torque specified in manual to terminals. Check drive and motor capacities. If output transistor damaged: Replace control board or entire drive.
LFB Low Feedback	Cause: The feedback signal is too low (dropped below P1-08 for time set in P1-09). Remedy: Set the Low Feedback fault characteristics in P1-08 and P1-09. Check P1-10 (Low Feedback Selection). Check L5-40 (Low Feedback Fault Retry Selection).
LF2 Output Current Imbalance	Cause: One or more phases in output current lost; Phase loss on output side; Loose terminal wires; Output circuit damaged; Motor impedance uneven. Remedy: Check for faulty wiring or poor connections on the output side. Apply tightening torque to terminals. Measure line-to-line resistance for each motor phase. Ensure values match. If output circuit damaged: Replace control board or entire drive.
LOAUX Low PI Auxiliary Feedback Level	Cause: PI Aux Feedback has fallen below Q6-09 level for longer than time set in Q6-10. Remedy: Raise the PI Aux Feedback level. Adjust parameters Q6-09 and Q6-10.
LOP Loss of Prime	Cause: Pump load (current/power) dropped below P1-19 level for time set in P1-20. Remedy: Check for a dry well, air in the system, or no water. Restart pump using preferred priming method. Set Loss of Prime fault characteristics in P1-18, P1-19, P1-20, and P1-21. Check L5-51 (Fault Retry) and P1-23 (Max Restart Time).
LOSUC Low Suction Pressure	Cause: Suction pressure has fallen below Q5-09 level for longer than time set in Q5-10. Remedy: Increase the system pressure. Set Low Suction fault characteristics in Q5-09, Q5-10, and Q5-18. Check Q5-11 (Behavior Select) and Q5-15 (Auto-restart Time).
LOWFL Low Flow	Cause: Insufficient flow; Measured flow fallen below P6-06 level for time set in P6-07. Remedy: Increase flow. Set Low Flow fault characteristics in P6-06, P6-07, and P6-08. Check P6-09 (Flow Select) and P6-10 (Auto-restart Time).
LOWWL Low Water Level	Cause: Water level fallen below level set in Q4-09 for longer than time set in Q4-10. Remedy: Raise the water level. Set Low Water Level fault characteristics in Q4-09 and Q4-10. Check Q4-11 (Behavior) and Q4-12 (Auto-restart Time).
LWL Low Water Level (Digital Input)	Cause: The “Low Water Level” digital input is active; Switch defective or P1-30 programmed incorrectly. Remedy: Raise the water level. Adjust the Low Water Level switch.
NMS Not Maintaining Setpoint	Cause: Feedback deviates from setpoint > P1-15 for time set in P1-16; Setpoint cannot be maintained. Remedy: Check for a blocked impeller, over cycling, or broken pipe. Set Not Maintaining Setpoint fault characteristics in P1-16 and P1-17. Check L5-50 (Setpoint Not Met Retry).
nSE Node Setup Error	Cause: A terminal assigned to the node setup function closed during run; Run command issued while node setup active. Remedy: Stop the drive when using the node setup function.
oC Overcurrent	Cause: Drive sensors detected output current greater than specified level. Causes include: damaged motor/insulation, shorted cables, load too heavy, accel/decel too short, specialized motor usage, V/f setting issues, excessive torque compensation. Remedy: Check insulation resistance and motor cables (remove shorts). Measure current flowing into motor; replace with larger drive if necessary. Increase acceleration time (C1-01, C1-03). Check motor capacity matches drive rating. Check V/f settings (E1-04 through E1-10). Reduce torque compensation gain (C4-01). Check for noise interference on control/circuit lines. Enable Speed Search (b3-01 = 1) if starting while coasting.
oFA00 Option Card Connection Error at Option Port CN5-A	Cause: The option card installed into port CN5-A is incompatible with the drive. Remedy: Check if the drive supports the option card to be installed. Contact Yaskawa for assistance.
oFA01 Option Card Fault at Option Port CN5-A	Cause: The option card connection to port CN5-A is faulty. Remedy: Turn off the power and reconnect the option card. Check if the option card is properly plugged into the option port. Make sure the card is fixed properly. If the option is not a communication option card, try to use the card in a different option port. If it works there, CN5-A is damaged (replace drive). If the error persists (oFb01 or oFC01 occur), replace the option card.
oFA03 to oFA06 oFA10, oFA11 oFA12 to oFA17 oFA30 to oFA43 Option Card Error (CN5-A)	Cause: Option card or hardware is damaged. Remedy: Cycle power to the drive. If the problem continues, replace the control board or the entire drive. Contact Yaskawa.
oFb00 Option Card Fault at Option Port CN5-B (Compatibility)	Cause: 1. Option card in CN5-B is incompatible. 2. A communication option card has been installed in CN5-B. Remedy: Make sure the drive supports the option card to be installed. Communication option cards are only supported by option port CN5-A. Remove from CN5-B.
oFb01 Option Card Fault at Option Port CN5-B (Connection)	Cause: The option card connection to port CN5-B is faulty. Remedy: Turn off the power and reconnect the option card. Check if the option card is properly plugged in and fixed properly. Try to use the card in a different option port to test if the card or the port is damaged. If CN5-B is damaged, replace the drive. If the card is damaged, replace the card.
oFb02 Option Card Fault at Option Port CN5-B (Duplicate Type)	Cause: An option card of the same type is already installed in option port CN5-A. Remedy: Only one of each option card type can be installed simultaneously. Install a communication option, digital input, or analog input option. Ensure no duplicates.
oFb03 to oFb11 oFb12 to oFb17 Option card error at Option Port CN5-B	Cause: Option card or hardware is damaged. Remedy: Cycle power to the drive. If the problem continues, replace the control board or the entire drive.
oFC00 Option Card Connection Error at Option Port CN5-C	Cause: 1. Option card in CN5-C is incompatible. 2. A communication option card is installed in CN5-C. Remedy: Confirm drive supports the option card. Move communication option card to port CN5-A (only supported there).
oFC01 Option Card Fault at Option Port CN5-C (Connection)	Cause: The option card connection to port CN5-C is faulty. Remedy: Turn the power off and reconnect the option card. Check if the option card is properly plugged in. Test card in a different port. If CN5-C is damaged, replace drive.
oFC02 Option Card Fault at Option Port CN5-C (Duplicate Type)	Cause: An option card of the same type is already installed in CN5-A or CN5-B. Remedy: Only one of each option card type can be installed simultaneously. Check installed cards and remove duplicates.
oFC03 to oFC11 oFC12 to oFC17 Option Card Error at Option Port CN5-C	Cause: Option card or hardware is damaged. Remedy: Cycle power to the drive. If the problem continues, replace the control board or the entire drive.
oFC50 to oFC55 Option Card Error at Option Port CN5-C	Cause: Option card or hardware is damaged. Remedy: Refer to the appropriate option manual for details.
oH Heatsink Overheat	Cause: Heatsink temperature exceeded the pre-alarm level (L8-02). Surrounding temp too high or Load too heavy. Remedy: Check temperature surrounding the drive. Verify it is within specifications. Improve air circulation or install a fan/AC. Remove heat sources near the drive. Measure output current and decrease load if necessary. Lower the carrier frequency (C6-02).
Internal cooling fan is stopped	Cause: Cooling fan failure or end of life. Remedy: Replace the cooling fan. After replacing, set parameter o4-03 to 0 to reset the cooling fan maintenance.
oH1 Overheat 1 (Heatsink Overheat)	Cause: Heatsink temperature exceeded the drive overheat level. Remedy: Check/lower surrounding temperature. Improve air circulation within the enclosure. Check for heat sources nearby. Measure output current/reduce load. Lower carrier frequency (C6-02).
oH3 Motor Overheat Alarm (PTC Input)	Cause: Motor has overheated. Signal at A1, A2, or A3 exceeded fault detection level. Remedy: Check load size, accel/decel times, and cycle times. Decrease load if needed. Increase acceleration/deceleration times (C1-01 to C1-04). Adjust V/f pattern (reduce E1-08 and E1-10). Check motor rated current and E2-01 setting. Ensure motor cooling system is operating normally.
oH4 Motor Overheat Fault (PTC Input)	Cause: Motor has overheated (Fault level exceeded). Remedy: Check load size and cycle times. Decrease load. Increase acceleration/deceleration times. Adjust V/f pattern (reduce E1-08/E1-10) to improve load tolerance at low speeds. Check motor rated current and E2-01 setting. Repair or replace motor cooling system.
oL1 Motor Overload	Cause: Electronic motor overload protection tripped. Load too heavy or cycle times too short. Remedy: Reduce the load. Increase acceleration and deceleration times (C1-01 through C1-04).
oL2 Drive Overload	Cause: The thermal sensor of the drive triggered overload protection. Remedy: Load too heavy: Reduce the load. Accel/Decel too short: Increase settings (C1-01 through C1-04). Output voltage too high: Adjust V/f pattern (E1-04 to E1-10); reduce E1-08/E1-10. Drive capacity too small: Replace with a larger model. Low speed operation: Reduce load at low speeds or replace with larger frame size. Lower carrier frequency (C6-02). Excessive torque comp: Reduce gain in C4-01. Speed Search issues: Adjust b3-02/b3-03. Set b3-24 to 1. Input phase loss: Check power supply.
oL3 Overtorque Detection 1	Cause: Current exceeded value in L6-02 for longer than time in L6-03. Remedy: Check L6-02 and L6-03 settings (Parameter settings not appropriate). Check status of the load (e.g., machine locked up). Remove the cause of the fault.
oL4 Overtorque Detection 2	Cause: Current exceeded value in L6-05 for longer than time in L6-06. Remedy: Check the settings of parameters L6-05 and L6-06.
oPr External HOA Keypad Connection Fault	Cause: The HOA keypad has been disconnected from the drive. Remedy: Check the connection between the keypad and the drive. Replace the cable if damaged. Turn off drive input power, disconnect keypad, reconnect, and reapply power.
ov Control Circuit Overvoltage	Cause: Voltage in control circuit exceeded level (approx 450V for 200V class / 900V for 400V class). Remedy: Ground fault: Check motor wiring for ground faults. Correct grounding shorts. Input voltage too high: Check voltage and lower it within limits. PS capacity too small: Use power supply with at least twice the input capacity of the drive. Chattering: Implement countermeasures for input power or Magnetic Contactor (MC) chattering. Phase loss/imbalance: Check status of input power supply. Loose I/O: Check tightening torque of I/O terminals.
PoC Pump Over Cycle	Cause: Pump exceeded cycle count (P2-10) within time (P2-11). Remedy: Set Pump Over Cycle characteristics in P2-10 and P2-11. Review Over Cycling Mode (P2-12) and Retry Selection (L5-52). Check setpoint compensation settings (P2-13, P2-14).
SCF Safety Circuit Fault	Cause: The safety circuit is damaged. Remedy: Replace either the control board or the entire drive. Contact Yaskawa or sales representative for instructions.
SEr Too Many Speed Search Restarts	Cause: Parameters related to Speed Search are set to the wrong values. Remedy: Reduce the detection compensation gain during Speed Search (b3-10). Increase the current level when attempting Speed Search (b3-17). Increase the detection time during Speed Search (b3-18). Repeat Auto-Tuning.
SoH Snubber Discharge Resistor Overheat	Cause: The input power supply voltage is too high, capacity is too small, or distortion is too large. The load was too large during repetitious operation. A phase loss occurred in the input power supply. Remedy: Reduce the voltage to within the range in the power supply specifications. Increase the capacity of the power supply or lower impedance of wiring. Check the load conditions. Reduce the load or increase acceleration/deceleration time. Check the input power supply for phase loss or an imbalance in the interphase voltages.
SPL Suction Pressure Loss	Cause: An analog input programmed for setting 23 “WaterLvl/Suction” has dropped below 3 mA or risen above 21 mA for longer than 1 second. Remedy: Repair pressure sensor or wiring.
SrC Phase Order Detection Fault	Cause: The power supply phase order changed during operation. An input power supply wiring terminal is loose. The fluctuation in the voltage of the input power supply is too large. Remedy: Investigate and correct the cause and reset the fault.
Srr Internal Resistance Fault	Cause: The snubber discharge resistor or peripheral circuits failed. Remedy: Cycle power to the drive. If the problem continues, replace either the control board or the entire drive.
TdE Time Data Error	Cause: An error has occurred in the Real-Clock Time function of the HOA keypad. Remedy: Replace the HOA keypad.
TIE Time Interval Error	Cause: An error has occurred in the Real-Time Clock function of the HOA keypad. Remedy: Replace the HOA keypad.
TIM Time Not Set	Cause: The Real-Time Clock for the HOA keypad is not set in parameter o4-17 (drive is new, o4-17 was reset, or battery is low/replaced). Remedy: Set o4-17 to 1 to set the time for the HOA keypad. Cycle power to the drive and set the Real-Time Clock within 30 seconds of power-up. Replace the HOA keypad battery and set the Real-Time Clock. If an error occurred in the function itself: Replace the HOA keypad.
UL3 Undertorque Detection 1	Cause: Parameter settings are not appropriate for the load. There is a fault on the machine side. Remedy: Check the settings of parameters L6-02 and L6-03. Check the load for any problems.
UL4 Undertorque Detection 2	Cause: Parameter settings are not appropriate for the load. There is a fault on the machine side. Remedy: Check L6-05 and L6-06 settings. Check the load for any problems.
UL6 Motor Underload	Cause: The output current has fallen below the motor underload curve defined in L6-14 for longer than the time set to L6-03. Remedy: Adjust the value set to L6-14 so that output current remains above the motor underload curve during normal operation.
Uv1 Control Circuit Undervoltage Fault	Cause: Input power phase loss or wired incorrectly. One of the drive input power wiring terminals is loose. There is a problem with the voltage from the drive input power. The power has been interrupted. The capacitors are worn. The relay or contactor on the soft-charge bypass circuit is damaged. Remedy: Correct the wiring. Ensure there are no loose terminals. Apply the tightening torque specified in the manual. Check the voltage. Correct voltage to be within range. Check for problems with the main circuit magnetic contactor. Check maintenance time for capacitors (U4-05). Replace drive if U4-05 exceeds 90%. Cycle power to the drive. If problem continues, replace the entire drive. Check monitor U4-06 for performance life of soft-charge bypass.
Uv2 Control Power Supply Voltage Fault	Cause: Control power supply wiring is damaged. Internal circuitry is damaged. Remedy: Cycle power to the drive. If the problem continues, replace the entire drive or the control power supply.
Uv3 Undervoltage 3 (Soft-Charge Bypass Circuit Fault)	Cause: The relay or contactor on the soft-charge bypass circuit is damaged. Remedy: Cycle power to the drive. If the problem continues, replace the entire drive. Check monitor U4-06 for the performance life of the soft-charge bypass. Replace the entire drive if U4-06 exceeds 90%.
VLTS Volute-Thermostat Fault	Cause: The digital input assigned to the volute/thermostat input is active. Both volute/thermostat inputs are programmed simultaneously. Remedy: Check the wiring or wait for the volute or motor to cool. Program only one digital input to either H1-xx = 88 or 89. Note: Auto-restart is controlled by parameter L5-53.
WLL Water Level Loss	Cause: An analog input programmed for setting 23 “WaterLvl/Suction” has dropped below 3 mA or risen above 21 mA for longer than 1 second. Remedy: Repair level sensor or wiring.
ACCUM Accumulated Level Error	Cause: The accumulated level has exceeded the values set in P6-11 to P6-14. This is only effective when P6-15 (Accumulated Behavior) is set to 1 (alarm). Remedy: Set the Accumulated Level fault characteristics in P6-11 to P6-14 and P6-16. Drive response to this condition is controlled by P6-15. Auto-restart of this fault is controlled by P6-15 and P6-05.
Accum Lvl Reached Flow Accumulation level reached	Cause: Accum Behavior P6-15 is set to 5 (Stop, Alarm, & Reset) and the Accumulated Level has been reached. Remedy: Cycle the Run command.
AEr Station Address Setting Error	Cause: Station number is set outside the possible setting range (CC-Link, CANopen, MECHATROLINK). Remedy: Set parameter F6-10 to the proper value when using a CC-Link option. Set parameter F6-35 to the proper value when using a CANopen option.
Anti-Jam Active Anti-Jam Alarm	Cause: The drive was not able to clear debris from the impeller in fewer than the attempts set in P7-02. (Effective when P7-01 is enabled). Remedy: Check for proper pump operation. Set the Anti-jam fault characteristics in P7-02 to P7-08. Drive response is controlled by P7-01.
AUv Power Supply Undervoltage	Cause: The power supply voltage is low or a phase loss occurred in the input power supply. Remedy: Increase the power supply voltage. Check the input power supply for phase loss or an imbalance in the interphase voltages. Investigate and correct the cause and then reset the fault.
AUXFB PI Aux Lvl Loss (Wire-break detection)	Cause: The analog input programmed for “PI Aux FB Level” (H3-XX = 27) has dropped below 3 mA or risen above 21 mA for longer than 1 second. Remedy: Repair transducer or wiring.
Backup FdBk Lost Backup Feedback Device lost	Cause: Wire-break on Analog Input Terminal (H3-XX = 24) or Backup PI Feedback Transducer is broken. Remedy: Check the connection of the Backup Feedback transducer. Replace Backup PI Feedback Transducer.
bAT Keypad Battery Voltage Low	Cause: The keypad battery is low. Remedy: Replace the keypad battery.
bb Baseblock	Cause: External baseblock signal was entered via one of the multi-function input terminals (S1 to S8). Remedy: Check external sequence and baseblock signal input timing.
boL Braking Transistor Overload Fault	Cause: The proper braking resistor has not been installed. Remedy: Select the proper braking resistor.
bUS Option Communication Error	Cause: Connection broken, master controller stopped, option damaged, or data error due to noise. Remedy: Check for faulty wiring or disconnected cables/short circuits. If the fault continues, replace the option. Check connector pins alignment and reinstall the option. Check options to minimize noise (surge absorbers, shielding, grounding). Install an EMC noise filter to the drive input power.
CALL Serial Communication Transmission Error	Cause: Communication not established due to wiring faults, programming errors, damaged circuitry, or incorrect termination. Remedy: Check for wiring errors, short circuits, or disconnected cables. Check communications at start-up and correct programming errors. Perform self-diagnostics; replace control board if needed. Install/check termination resistor at both ends of the communication line.
CE MEMOBUS/Modbus Communication Error	Cause: Data error due to noise, incompatible protocol, CE detection time (H5-09) too short, or cable damage. Remedy: Check noise reduction options (grounding shields, surge absorbers, EMC filters). Check H5 parameter settings and protocol compatibility. Set a longer CE detection time using parameter H5-09. Check the PLC software settings. Check connector signals or replace the communication cable.
CE (Run at H5-14) Comm Loss Run at H5-14	Cause: Similar to standard CE fault (Noise, Protocol incompatibility, Timing, or Cable issues) but drive continues to run based on settings. Remedy: Minimize noise effects (wiring, grounding, filters). Check H5 parameters and PLC settings. Increase CE detection time (H5-09). Check/replace communication cables.
CrST Cannot Reset	Cause: Fault reset was being executed when a Run command was entered. Remedy: Ensure that a Run command cannot be entered from external terminals/option during fault reset. Turn off the Run command.
Current Limit Foldback Current Limit Foldback	Cause: Drive output speed is being limited due to the output current limit. Remedy: Reduce the load. Verify setting of Q3-02. Change to a larger drive size.
CyC MECHATROLINK Comm. Cycle Setting Error	Cause: The controller is using a comm. cycle beyond the allowable setting range. Remedy: Set the comm. cycle for the upper controller within the allowable setting range for the MECHATROLINK option.
De-Scale/De-rag Active De-scale is running	Cause: De-scale is programmed and enough run time has been accumulated. Remedy: If De-scale/De-rag is not desired, program P8-01 = 0 (Disabled). Adjust the De-scale Run Timer P8-08.
Differential FB Detected Differential Feedback Detected	Cause: The difference between the PID Feedback and the Differential Feedback exceeded P4-18 level for time set in P4-19. Remedy: Replace the feedback transducer or transducers. Verify parameter settings P4-18 to P4-20.
dnE Drive Disabled	Cause: “Drive Enable” is set to a multi-function contact input (H1-XX = 6A) and the contact is open. Remedy: Check the operation sequence.
doH Damping Resistor Overheat	Cause: Power supply capacity too small, distortion too large, or phase loss in input power. Remedy: Increase the capacity of the power supply. Lower the impedance of the input power supply wiring. Check input power supply for phase loss or imbalance.
EF Forward/Reverse Run Command Input Error	Cause: Both forward run and reverse run closed simultaneously for longer than 0.5 s. Remedy: Check the forward and reverse command sequence and correct the problem. Note: When minor fault EF is detected, motor ramps to stop.
EF0 Option Card External Fault	Cause: An external fault was received from the PLC, or there is a problem with the PLC program. Remedy: Remove the cause of the external fault. Remove the external fault input from the PLC. Check the PLC program and correct problems.
EF1 to EF8 Pump Fault (Input Terminals S1-S8)	Cause: An external device tripped an alarm, wiring is incorrect, or multi-function inputs are set incorrectly. Remedy: Remove the cause of the external fault and reset the multi-function input value. Ensure signal lines are connected properly (H1-XX = 20 to 2F). Reconnect the signal line. Check if unused terminals have been set for Pump Fault. Change terminal settings.
FAn Internal Fan Error	Cause: Internal cooling fan has malfunctioned or fault detected in the magnetic contactor. Remedy: Cycle power to the drive. Check for fan operation. Verify cumulative operation time (U4-03) and maintenance timer (U4-04). Replace the fan if performance life exceeded or damaged. If fault continues, replace power board/gate drive board or entire drive.
Fdv Power Supply Frequency Fault	Cause: The input power supply frequency exceeded the allowable frequency fluctuation. A momentary power loss occurred. An input power supply wiring terminal is loose. The fluctuation in the voltage of the input power supply is too large. The built-in fuse is open. The phase rotation direction has changed in the input power supply. The detected power supply frequency exceeded the allowable value. Remedy: Reset the fault. Check for loose terminals. Increase the Power Supply Frequency Fault Detection Width (L2-27). Replace either the control board or the entire drive (Contact Yaskawa). Correct the wiring. Improve the power supply.
Feedback Loss Go To Freq. b5-13 PI Feedback Loss	Cause: PI feedback source is incorrectly installed or is not working. Effective only when b5-12 is set to 3 (Run at b5-13). Remedy: Confirm that the PID feedback source is installed and working properly. Drive response is controlled by b5-12 and b5-13.
Feedback Loss Wire Break PI Feedback Loss	Cause: PI feedback source is incorrectly installed or is not working (Analog input > 21 mA or < 3 mA). Effective when b5-12 is set to 1. Remedy: Confirm that the PID feedback source is installed and working properly. Drive response is controlled by b5-12 and b5-13. Auto-restart is controlled by L5-42.
Freq. Ref Pump Min (P1-06) Minimum Pump Frequency Reference	Cause: The frequency reference is set lower than P1-06 while the drive is NOT in PI Mode and Minimum Pump Frequency is enabled. Remedy: Increase the frequency reference to a value greater than P1-06.
Freq. Ref Thrust (P4-12) Thrust Frequency Reference	Cause: The frequency reference is set lower than P4-12 while the drive is NOT in PI Mode and Thrust bearing is enabled. Remedy: Increase the frequency reference to a value greater than P4-12.
Hbb Safe Disable Signal Input (Both Channels Open)	Cause: Both Safe Disable Inputs H1 and H2 are open. Internally, both Safe Disable channels are broken. Remedy: Check signal status at input terminals H1 and H2. Check Sink/Source Selection for digital inputs. If Safe Disable is not utilized, link terminals H1-HC and H2-HC. Replace control board or entire drive.
HbbF Safe Disable Signal Input (One Channel Open)	Cause: The signals to the Safe Disable inputs are wrong or wiring is incorrect. One of the Safe Disable channels is faulty. Remedy: Check signal status at input terminals H1 and H2. If Safe Disable is not utilized, link terminals H1-HC and H2-HC. Replace control board or entire drive.
HCA Current Alarm	Cause: Drive current exceeded overcurrent warning level (150% of rated current). Load is too heavy. Acceleration/deceleration times are too short. Special-purpose motor used or motor capacity too large. Current level increased due to Speed Search after momentary power loss. Remedy: Reduce load (or replace drive for heavy applications). Calculate required torque and inertia moment. Increase accel/decel times (C1-01 through C1-04). Check motor capacity and ensure it is within allowable range. (For Speed Search): No action needed, alarm appears briefly.
HIAUX High PI Auxiliary Feedback Level	Cause: PI Aux Feedback risen above Q6-12 level for time set in Q6-13 (Drive in AUTO). Remedy: Lower the PI Aux Feedback level. Adjust parameters Q6-12 and Q6-13.
HIFLO High Flow Error	Cause: The flow is too high / Meter detected high flow condition. Remedy: Reduce the flow. Set High Flow fault characteristics in P6-17 and P6-18. Drive response controlled by P6-19. Auto-restart controlled by P6-19.
High Feedback High FB Sensed High Feedback Level Alarm	Cause: The feedback signal is too high (above P1-11 level). Remedy: Decrease the feedback signal. Set High Feedback alarm characteristics in P1-11 and P-12. Drive response controlled by P1-13.
HISUC High Section Pressure	Cause: Suction pressure has fallen below level in Q5-12 (Note: Alarm name says High, Description discusses falling below level – logic per manual). Remedy: Reduce the system pressure. Set High Suction Pressure alarm characteristics in Q5-12. Drive response controlled by Q5-14. Auto-restart controlled by Q5-14 and Q5-15.
LOAUX Low PI Auxiliary Feedback Level	Cause: PI Aux Feedback fallen below Q6-09 level for time set in Q6-10 (HAND or AUTO). Remedy: Raise the PI Aux Feedback level. Adjust parameters Q6-09 and Q6-10.
LOP Loss of Prime	Cause: Measured water quantity dropped below P1-19 level for time P1-20. (Dry well, air in system, no water). Remedy: If resistance in pump, allow system to pump water again. Set Loss of Prime alarm characteristics in P1-18, P1-19, P1-20, P1-21. Drive response controlled by P1-21.
LOSUC Low Section Pressure	Cause: Suction pressure fallen below level Q5-09 for time Q5-10. Remedy: Increase the system pressure. Set Low Suction alarm characteristics in Q5-09, Q5-10, Q5-18. Drive response controlled by Q5-11.
Low City Pressure Low City Pressure	Cause: Insufficient pressure on inlet to pump (Input P4-24/P4-21 active). Remedy: Check pressure switch contact for correct operation. Check control wiring to drive terminal strip. Check that suction pressure is present via separate measuring device.
Low Feedback Low FB Sensed Low Feedback Level Alarm	Cause: The feedback signal is too low (dropped below P1-08). Remedy: Increase the feedback signal. Set Low Feedback alarm characteristics in P1-08 and P1-09. Drive response controlled by P1-10.
LOWFL Low Flow	Cause: Insufficient flow (measured water flow below P6-06 for time P6-07). Remedy: Increase flow. Set Low Flow fault characteristics in P6-06, P6-07, and P6-08. Drive response controlled by P6-09. Auto-restart controlled by P6-09 and P6-10.
Low Suction Pressure Low Suction Pressure	Cause: Insufficient suction pressure present (Digital input activated). Remedy: Check pressure switch contact and wiring. Verify suction pressure with separate device. Increase system pressure. Set Low Suction alarm characteristics in Q5-09 and Q5-18. Drive response controlled by Q5-11.
Low Water in Tank Low Water in Tank	Cause: Insufficient pressure on inlet (Low water level input activated). Remedy: Check pressure switch contact and wiring. Verify suction pressure/water level. Raise the water level. Set Low Water Level alarm characteristics in Q4-09. Drive response controlled by Q4-11.
LOWWL Low Water Level	Cause: Water level fallen below Q4-09 level for time Q4-10. Remedy: Raise the water level. Set Low Water Level fault characteristics in Q4-09 and Q4-10. Drive response controlled by Q4-11. Auto-restart controlled by Q4-11 and Q4-12.
LT-1 Cooling Fan Maintenance Time	Cause: The cooling fan has reached 90% of its expected performance life. Remedy: Replace the cooling fan. Set o4-03 to 0 to reset the Maintenance Monitor.
LT-2 Capacitor Maintenance Time	Cause: Main circuit and control circuit capacitors have reached 90% of expected performance lives. Remedy: Replace either the control board or the entire drive. Contact Yaskawa or sales representative.
LT-3 Soft Charge Bypass Relay Maintenance Time	Cause: DC bus soft charge relay has reached 90% of expected performance life. Remedy: Replace either the control board or the entire drive. Contact Yaskawa or sales representative.
LT-4 IGBT Maintenance Time (50%)	Cause: IGBTs have reached 50% of their expected performance life. Remedy: Check the load, carrier frequency, and output frequency.
Main FdBk Lost Using Backup FB Main Feedback Device Lost	Cause: Wire-break on Analog Input Terminal programmed for Primary PI Feedback. Main PI Feedback Transducer is broken. Remedy: Check the connection of the Main Feedback transducer. Replace Main PI Feedback Transducer.
NMS Not Maintaining Setpoint	Cause: Feedback deviates from setpoint > P1-15 for time P1-16 (P1-17 set to 1). Remedy: Check for a blocked impeller, over cycling, or broken pipe. Set Not Maintaining Setpoint alarm characteristics in P1-16 and P1-17. Drive response controlled by P1-17.
oH Heatsink Overheat	Cause: Heatsink temperature exceeded L8-02 level. Surrounding temperature is too high. Internal cooling fan has stopped. Airflow around the drive is restricted. Remedy: Check surrounding temperature / Install AC or fan. Replace cooling fan (reset o4-03). Ensure proper installation space (see manual). Clear dust/debris clogging the fan.
oH2 Drive Overheat Warning	Cause: “Drive Overheat Warning” was input to a multi-function input terminal, S1 through S8 (H1-xx= B). An external device triggered an overheat warning in the drive. Remedy: Search for the device that tripped the overheat warning. Remove the cause of the problem.
oH3 Motor Overheat	Cause: The motor overheat signal entered to a multi-function analog input terminal exceeded the alarm level. Common causes include: Motor thermostat wiring is faulty (PTC input). Fault on the machine side (e.g., machine locked up). Motor has overheated due to load, cycle times, or cooling issues. Remedy: Repair the PTC input wiring. Check the status of the machine and remove the cause of the fault. Check load size, decrease load, or increase accel/decel times (C1-01 to C1-04). Adjust the preset V/f pattern (reduce E1-08 and E1-10), but not excessively. Check motor-rated current and enter correct value in E2-01. Ensure motor cooling system is operating normally.
oL1 Motor Overload	Cause: The electronic motor overload protection tripped. Possible causes: Load is too heavy. Cycle times are too short during acceleration/deceleration. General-purpose motor driven below rated speed with high load. Output voltage too high. Wrong motor rated current set in E2-01. Base frequency set incorrectly. Mismatch between thermal protection and motor characteristics. Motor overheated by overexcitation. Speed Search parameters set incorrectly. Remedy: Reduce the load or increase accel/decel times (C1-01 through C1-04). If operating at low speeds, increase motor capacity or use a dedicated motor. Adjust V/f pattern (reduce E1-08/E1-10). Verify and enter correct motor rated current (E2-01) and base frequency (E1-06). Check motor characteristics and correct L1-01 setting. Reduce excitation deceleration gain (n3-13) or set L3-04 to a value other than 4. Adjust Speed Search current (b3-03) and deceleration time (b3-02).
oL2 Drive Overload	Cause: The thermal sensor of the drive triggered overload protection. Possible causes: Load is too heavy. Accel/decel time is too short. Output voltage is too high. Drive capacity is too small. Overload occurred when operating at low speeds. Excessive torque compensation. Speed Search parameters incorrect. Output current fluctuation due to input phase loss. Remedy: Reduce the load. Increase acceleration and deceleration times (C1-01 through C1-04). Adjust V/f pattern by reducing E1-08 and E1-10 (do not lower excessively). Replace the drive with a larger model. Lower the carrier frequency (C6-02). Reduce torque compensation gain (C4-01). Check power supply for phase loss.
oL3 Overtorque Detection 1	Cause: The current has exceeded the value set for torque detection (L6-02) for longer than the allowable time (L6-03). Parameter settings not appropriate for load. Fault on the machine side (e.g., locked up). Remedy: Check L6-02 and L6-03 settings. Check the status of the load and remove the cause of the fault.
oL4 Overtorque Detection 2	Cause: The current has exceeded the value set for Overtorque Detection 2 (L6-05) for longer than the allowable time (L6-06). Remedy: Check the settings of parameters L6-05 and L6-06.
ov Control Circuit Overvoltage	Cause: Voltage in the control circuit has exceeded the overvoltage level (approx 450V for 200V class; 900V for 400V class). Ground fault in output circuit causing capacitor overcharge. Drive input power voltage is too high. Input power supply capacity too small. Input power supply chattering (on/off repeatedly). Loose I/O terminal. Remedy: Check motor wiring for ground faults. Check voltage and lower input power within limits. Use a power supply with at least twice the input capacity of the drive. Implement countermeasures to prevent chattering. Check tightening torque of I/O terminals.
N/A (MC Chat) Magnetic Contactor Chattering	Cause: Chattering in the magnetic contactor (MC) installed between the drive output terminals and the motor. Remedy: Implement countermeasures so that chattering does not occur for the MC.
N/A (Phase) Input Power Phase Loss	Cause: There is a phase loss or an imbalance in the interphase voltages of the input power supply. Remedy: Check the status of the input power supply and eliminate phase losses and imbalance.
PoC Pump Over Cycle	Cause: The pump has exceeded the number of cycles set in P2-10 in the time set in P2-11. Remedy: Set the Pump Over Cycle alarm characteristics in P2-10 and P2-11. Drive response is controlled by P2-12, Over Cycling Mode.
R-DNE-S[] Remote Drive Disable	Cause: Terminal S[] has been closed (or open depending on setting) for the time set in P4-26. Remedy: Remove conditions causing the terminal to close (if N.O.) or open (if N.C.).
SE MEMOBUS/Modbus Test Mode Error	Cause: A digital input set to 67H (MEMOBUS/Modbus test) was closed while the drive was running. Remedy: Stop the drive and run the test again.
SPL Suction Pressure Loss	Cause: Wire-break detection for suction pressure. An analog input programmed for setting 23 has dropped below 3mA or risen above 21mA. Remedy: Repair pressure sensor or wiring.
SrC Phase Order Detection Fault	Cause: The phase rotation direction for the input power supply changed. Input power supply wiring terminal is loose. Large fluctuation in voltage of input power supply. Remedy: Investigate and correct the cause and reset the fault.
UL3 Undertorque Detection 1	Cause: The current has fallen below the minimum value set for torque detection (L6-02) for longer than the allowable time (L6-03). Parameter settings not appropriate for load. Fault on the machine side. Remedy: Check the settings of parameters L6-02 and L6-03. Check the load for any problems.
UL4 Undertorque Detection 2	Cause: The current has fallen below the minimum value set for torque detection (L6-05) for longer than the allowable time (L6-06). Remedy: Check L6-05 and L6-06 settings. Check the load for any problems.
UL6 Motor Underload	Cause: The load has fallen below the underload curve defined in L6-14. Remedy: Adjust the value set to L6-14 so that output current remains above the motor underload curve during normal operation.
Uv Control Circuit Undervoltage	Cause: Input power phase loss (incorrect wiring). Loose drive input power wiring terminals. Problem with voltage from drive input power (voltage incorrect or magnetic contactor issue). Power interrupted. Capacitors are worn (check U4-05). Drive input power transformer too small (voltage drops when switched on). Remedy: Correct the main circuit wiring. Ensure no loose terminals and apply tightening torque. Check voltage is within specifications. Check main circuit magnetic contactor. Correct drive input power. Replace drive if U4-05 exceeds 90%. Check capacity of the drive input power transformer.
WLL Water Level Loss	Cause: An analog input programmed for setting 23 “WaterLvl/Suction” has dropped below 3 mA or risen above 21 mA for longer than 1 second. Remedy: Repair level sensor or wiring.
oPE01 Drive Capacity Setting Fault	Cause: The drive model selection (o2-04) and the actual capacity of the drive are not the same. Remedy: Correct the value set to o2-04 so it matches the drive capacity.
oPE02 Parameter Range Setting Error	Cause: Parameters were set outside the possible setting range. Remedy: Use U1-18 to find parameters set outside the range. Set parameters to the proper values.
oPE03 Multi-Function Input Selection Error	Cause: A contradictory setting is assigned to multi-function contact inputs H1-01 to H1-08. Examples include: The same function is assigned to two inputs (excluding “Not used” and “External Fault”). Up command set without Down command (or vice versa). Conflicting Run/Stop commands (2-wire vs 3-wire logic). Simultaneous contradictory functions (e.g., Hold Accel/Decel Stop AND Analog Frequency Reference Sample/Hold). PID control enabled simultaneously with Up/Down command. Remedy: Ensure all multi-function inputs are assigned to different functions. Properly set functions required for use in combination (e.g., if Up is set, set Down). Check for contradictory settings assigned to input terminals. If PID and Up/Down are both enabled, set b5-01 to 0 to disable PID or disable the Up/Down command.
oPE04 Initialization Required (Term <-> Ctrl Chg)	Cause: The drive, control board, or terminal board have been replaced and the parameter settings between the control board and the terminal board no longer match. Remedy: Set A1-03 to 5550 to load the parameter settings stored in the terminal board to the drive. Initialize parameters after drive replacement by setting A1-03 to 1110 or 2220.
oPE05 Run Command/Frequency Reference Source Selection Error	Cause: Frequency reference assigned to an option card (b1-01 = 3) but no card is connected. Run command assigned to an option card (b1-02 = 3) but no card is connected. Frequency reference assigned to pulse train input (b1-01 = 4) but terminal RP is not set for frequency reference (H6-01 > 0). Remedy: Reconnect the input option card to the drive. If using pulse train input, set H6-01 to 0.
oPE07 Multi-Function Analog Input Selection Error	Cause: A contradictory setting is assigned to multi-function analog inputs H3-02, H3-10, or H3-06, or PID functions conflict. At least two analog input terminals are set to the same function. PID Feedback or PID Target Value assigned to analog inputs while Pulse Train is also assigned to PID functions. Remedy: Change settings H3-02, H3-10, and H3-06 so functions no longer conflict. Disable one of the PID selections if conflicting with Pulse Train.
oPE08 Parameter Range Setting Error	Cause: Parameters were set outside the possible setting range. Remedy: Use U1-18 to find parameters set outside the range. Set parameters to the proper values.
oPE09 PID Control Selection Fault	Cause: PID control function selection is incorrect (requires b5-01 = 1 to 4). b5-15 is not set to 0.0 (PID Sleep) while stopping method is DC Injection or Coast with timer. b5-01 set to 1 or 2 (PID enabled) but lower limit (d2-02) is not 0 while reverse output is enabled. b5-01 set to 3 or 4 (PID enabled) but lower limit (d2-01) is not 0. Remedy: Set b5-15 to a value other than 0.0 or change stopping method (b1-03). Correct the parameter settings for frequency reference lower limits (d2-01, d2-02).
oPE10 V/f Data Setting Error	Cause: V/f pattern setting error. One of the following errors occurred: E1-09 ≤ E1-07 < E1-06 ≤ E1-11 ≤ E1-04. Remedy: Correct the settings for E1-04, E1-06, E1-07, E1-09, and E1-11 to follow the required hierarchy.
oPE11 Carrier Frequency Setting Error	Cause: The following contradictory settings occurred: C6-05 > 6 and C6-04 > C6-03 (Lower limit > Upper limit). The upper and lower limits between C6-02 and C6-05 are contradictory. Remedy: Correct the setting for the carrier frequency parameters.
oPE18 Online Tuning Parameter Setting Error	Cause: One of the following errors occurred while online tuning was enabled (A1-02 = 2): E2-02 was set below 30% of original default. E2-06 was set below 50% of original default. E2-03 = 0. Remedy: Set E2-02, E2-03, and E2-06 to the correct values.
oPE27 Flow Meter Input	Cause: Both analog and pulse input flow meters are programmed at the same time. Flow meter scaling is set to zero and flow meter is being used as PID feedback. Remedy: Reprogram H6-01, H3-02, H3-06, or H3-10. Reprogram P6-01, P1-02, or b5-01.
oPE30 Incorrect Input Voltage Adjustment	Cause: The input voltage offset adjustment has not been performed. o2-04 (Drive Model Selection) setting changed. EEPROM failed for the input voltage offset. Remedy: Contact Yaskawa or your nearest sales representative for information on clearing the error.
oPE31 Water Level/Suction Pressure/PI Aux Cause	Cause: One or both of the following conditions are present: More than one of these parameters is set to a nonzero value: Q4-01, Q5-01, or Q6-01. Both Water Level/Suction Pressure and PI Aux FB Level are programmed. Remedy: Confirm parameter settings of Q4-01, Q5-01, Q6-01, H3-02, H3-06 and H3-10.
oPE34 De-Scale Setting Error	Cause: The De-scale function is not allowed while Anti-Jam is enabled. Remedy: Review settings of parameters P1-01, P7-01, or P8-01.
End1 Excessive V/f Setting (detected only during Rotational Auto-Tuning)	Cause: The torque reference exceeded 20% during Auto-Tuning OR The results from Auto-Tuning the no-load current exceeded 80%. Remedy: Prior to Auto-Tuning, verify the information on the motor nameplate. Enter proper values from motor nameplate to parameters T1-02 and T1-04 and repeat Auto-Tuning. If possible, disconnect the motor from the load and perform Auto-Tuning. If the load cannot be uncoupled, use the current Auto-Tuning results.
End2 Motor Iron-Core Saturation Coefficient	Cause: Motor data entered during Auto-Tuning was incorrect. Remedy: Make sure the data entered to the T1 parameters match the information written on the motor nameplate. Restart Auto-Tuning and enter the correct information. Cause: Results from Auto-Tuning are outside the parameter setting range, assigning the iron-core saturation coefficients (E2-07 and E2-08) to temporary values. Remedy: Check and correct faulty motor wiring. Disconnect the motor from machine and perform Rotational Auto-Tuning.
End3 Rated Current Setting Alarm	Cause: The correct current rating printed on the motor nameplate was not entered into T1-04. Remedy: Check the setting of parameter T1-04. Check the motor data and repeat Auto-Tuning.
End4 Adjusted Slip Calculation Error	Cause: The calculated slip is outside the allowable range. Remedy: Make sure the data entered for Auto-Tuning is correct. If possible, perform Rotational Auto-Tuning. If not possible, perform Stationary Auto-Tuning 2.
End5 Resistance Tuning Error	Cause: The calculated resistance value is outside the allowable range. Remedy: Double-check the data entered for the Auto-Tuning process. Check the motor and motor cable connection for faults.
End6 Leakage Inductance Alarm	Cause: The calculated leakage inductance value is outside the allowable range. Remedy: Double-check the data entered for the Auto-Tuning process.
End7 No-Load Current Alarm	Cause: The entered no-load current value was outside the allowable range. Remedy: Check and correct faulty motor wiring. Cause: Auto-Tuning results were less than 5% of the motor rated current. Remedy: Double-check the data entered for the Auto-Tuning process.
Er-01 Motor Data Error	Cause: Motor data or data entered during Auto-Tuning was incorrect. Remedy: Check that the motor data entered to T1 parameters matches motor nameplate input before Auto-Tuning. Restart Auto-Tuning and enter the correct information. Cause: Motor output power and motor-rated current settings (T1-02 and T1-04) do not match. Remedy: Check the drive and motor capacities. Correct the settings of parameters T1-02 and T1-04. Cause: Motor rated current and detected no-load current are inconsistent. Remedy: Check the motor rated current and no-load current. Correct the settings of parameters T1-04 and E2-03.
Er-02 Minor Fault	Cause: An alarm was triggered during Auto-Tuning. Remedy: Exit the Auto-Tuning menu, check the alarm code, remove the alarm cause, and repeat Auto-Tuning.
Er-03 STOP Button Input	Cause: Auto-Tuning canceled by pressing STOP button. Remedy: Auto-Tuning did not complete properly. Restart Auto-Tuning.
Er-04 Line-to-Line Resistance Error	Cause: Motor data entered during Auto-Tuning was incorrect. Remedy: Make sure the data entered to the T1 parameters match the information written on the motor nameplate. Restart Auto-Tuning and enter the correct information. Cause: Results from Auto-Tuning are outside the parameter setting range or the tuning process took too long. (Faulty motor cable or cable connection). Remedy: Check and correct faulty motor wiring.
Er-05 No-Load Current Error	Cause: Motor data entered during Auto-Tuning was incorrect. Remedy: Make sure the data entered to the T1 parameters match the information written on the motor nameplate. Restart Auto-Tuning and enter the correct information. Cause: Results from Auto-Tuning are outside the parameter setting range or the tuning process took too long. Remedy: Check and correct faulty motor wiring. Perform Rotational Auto-Tuning. Cause: The load was too high during Rotational Auto-tuning. Remedy: Disconnect the motor from machine and restart Auto-Tuning. If motor and load cannot be uncoupled make sure the load is lower than 30%. If a mechanical brake is installed, make sure it is fully lifted during tuning.
Er-08 Rated Slip Error	Cause: Motor data entered during Auto-Tuning was incorrect. Remedy: Make sure the data entered to the T1 parameters match the information written on the motor nameplate. Restart Auto-Tuning and enter the correct information. Cause: Results from Auto-Tuning are outside the parameter setting range or the tuning process took too long. Remedy: Check and correct faulty motor wiring. Perform Rotational Auto-Tuning. Cause: The load was too high during rotational Auto-tuning. Remedy: Disconnect the motor from machine and restart Auto-Tuning. If motor and load cannot be uncoupled make sure the load is lower than 30%. If a mechanical brake is installed, make sure it is fully lifted during tuning.
Er-09 Acceleration Error	Cause: The motor did not accelerate for the specified acceleration time. Remedy: Increase the acceleration time (C1-01). Disconnect the machine from the motor if possible. Cause: Torque limit when motoring is too low (L7-01 and L7-02). Remedy: Check L7-01 and L7-02 settings. Increase the setting. Cause: The load was too high during Rotational Auto-Tuning. Remedy: Disconnect the motor from machine and restart Auto-Tuning. If motor and load cannot be uncoupled make sure the load is lower than 30%. If a mechanical brake is installed, make sure it is fully lifted during tuning.
Er-11 Motor Speed Fault	Cause: Torque reference is too high. Remedy: Increase the acceleration time (C1-01). Disconnect the machine from the motor if possible.
Er-12 Current Detection Error	Cause: One of the motor phases is missing (U/T1, V/T2, W/T3). Remedy: Check motor wiring and correct any problems. Cause: The current exceeded the current rating of the drive. Remedy: Check motor wiring for a short between motor lines. Close any magnetic contactors used between motors. Replace the control board or the entire drive. Cause: The current is too low. (Attempted Auto-Tuning without motor connected to the drive). Remedy: Connect the motor and restart Auto-Tuning. Cause: Current detection signal error. Remedy: Replace the control board or the entire drive. For instructions on replacing the control board, contact Yaskawa or your nearest sales representative.
Er-13 Leakage Inductance Error	Cause: Drive was unable to complete tuning for leakage inductance within 300 seconds. Remedy: Check all wiring and correct any mistakes. Check the motor rated current value written on the motor nameplate and enter the correct value to T1-04.
Er-17 Reverse Prohibited Error	Cause: Drive is prohibited from rotating the motor in reverse while attempting to perform Inertia Tuning. Remedy: Inertia Auto-Tuning cannot be performed if the drive is restricted from rotating in reverse. Assuming it is acceptable for the application to rotate in reverse, set b1-04 to 0 and then perform Inertia Tuning.
CoPy Writing Parameter Settings (flashing)	Cause: Parameters are being written to the drive. Remedy: This is not an error.
CPyE Error Writing Data	Cause: Failed writing parameters. Remedy: Attempt to write parameters again.
CSEr Copy Unit Error	Cause: Hardware fault. Remedy: Replace the HOA keypad or the USB Copy Unit.
dFPS Drive Model Mismatch	Cause: The drives used in the copy and write process are not the same model. The drive from which the parameters were copied is a different model. The drive to be written to is a different model. Remedy: Verify the model number of the drive from which the parameters were copied and the model of the drive to which those parameters will be written. Make sure the two drives are the same model and have the same software version.
End Task Complete	Cause: Finished reading, writing, or verifying parameters. Remedy: This is not an error.
iFEr Communication Error	Cause: A communication error occurred between the drive and the HOA keypad or the USB copy unit. A non-compatible cable is being used to connect the USB Copy Unit and the drive. Remedy: Check the cable connection. Use the cable originally packaged with the USB Copy Unit.
ndAT Model, Voltage Class, Capacity Mismatch	Cause: The drive from which the parameters were copied and the drive to which the parameters will be written have different electrical specifications, capacities, are set to different control modes, or are different models. The device being used to write the parameters is blank and does not have any parameters saved on it. Remedy: Make sure model numbers and specifications are the same for both drives. Make sure all connections are correct, and copy the parameter settings onto the USB Copy Unit or the HOA keypad.
rdEr Error Reading Data	Cause: Failed while attempting to read parameter settings from the drive. Remedy: Press and hold the READ key on the USB Copy Unit for at least one second to have the unit read parameters from the drive.
rEAd Reading Parameter Settings (flashing)	Cause: Displayed while the parameter settings are being read onto the USB Copy Unit. Remedy: This is not an error.
vAEr Voltage Class, Capacity Mismatch	Cause: The drive from which the parameters were copied and the drive on which the Verify mode is being performed have different electrical specifications or are a different capacity. Remedy: Make sure electrical specifications and capacities are the same for both drives.
vFyE Parameter settings in the drive and those saved to the copy function are not the same	Cause: Indicates that parameter settings that have been Read and loaded onto the Copy Unit or HOA keypad are different. Remedy: To synchronize parameters, either write the parameters saved on the USB Copy Unit or HOA keypad onto the drive, or Read the parameter settings on the drive onto the USB Copy Unit.
vrFy Comparing Parameter Settings (flashing)	Cause: The Verify mode has confirmed that parameters settings on the drive and parameters read to the copy device are identical. Remedy: This is not an error.
Anti Jam Active Anti-Jam Function Status	Cause: Displayed when the drive is performing the anti-jam function. Remedy: Information only. No action required.
De-staging in X sec De-staging Timer Status	Cause: Displayed during multiplexing when either a drive or contactor de-staging is in progress. X sec indicates the time left before the de-staging takes place. Remedy: Information only. Wait for timer to expire.
DigitalOut Delay Active Output Delay Status	Cause: Displayed when the Digital Output Delay function is active. Remedy: Information only.
Feedback Drop Check Sleep Mode Feedback Check	Cause: Displayed when the drive is determining whether the feedback will change abruptly when the drive enters Sleep Mode. Remedy: Check configuration: Drop Level is configured by P2-08, Delta Sleep Feedback Drop Level, and P2-09 Feedback Detection Drop Time.
Flow Rate Limit Speed Limited by Flow Rate	Cause: Drive output speed is being limited due to the Flow Rate (U1-83). Remedy: Check Flow Rate settings if limitation is unexpected.
Freq Reduction Active (P3-07) Staging Frequency Reduction	Cause: Maximum Frequency temporarily reduced due to Staging. Remedy: Information only.
LOCK Parameter Locked Write Protection Active	Cause: Displayed after an attempt to change a parameter when A1-01 = 3. Remedy: Unlock the keypad by setting A1-01 = 2.
Lube Pump Exit in Xsec Lube Pump Delay	Cause: The drive is delaying the start of the motor and the Lube Pump (H2-xx = 8B) digital output is energized. Remedy: Wait for timer (Xsec) to expire.
PASS MEMOBUS/Modbus Comm. Test Mode Complete Test Result	Cause: MEMOBUS/Modbus test has finished normally. Remedy: Information only.
Pre Chg Mode Exit in Xsec Pre-Charge Active	Cause: Pre-Charge 1 or 2 active. X indicates time left before pre-charge exits due to timers (P4-03 + P4-07). Remedy: Wait for timer to expire.
Primer Pump Exit in Xsec Primer Pump Delay	Cause: The drive is delaying the start of the motor and the Primer Pump (H2-xx = 8B) digital output is energized. Remedy: Wait for timer to expire.
ScreenMtrStarter Exit in Xsec Screen Motor Starter Delay	Cause: The drive is delaying the start of the motor and the Screen Motor Starter (H2-xx = 8B) digital output is energized. Remedy: Wait for timer to expire.
Setpoint Boost Active (P3-11) Staging Frequency Reduction	Cause: Maximum Frequency temporarily reduced due to Staging. Remedy: Information only.
Sleep Active Min/Max PIAuxLvl Sleep Mode (Aux Level)	Cause: Displayed when the PI Aux Feedback falls below the Q6-04/Q6-24 level for longer than the Q6-05 time forcing the drive to go to a sleep condition. Remedy: Check Q6-04/Q6-24 levels and Q6-05 timer if sleep is unexpected.
Sleep Active Min Suction Pres Sleep Mode (Suction Pressure)	Cause: Displayed when the drive has gone to sleep because the suction level has dropped below the level set in Q5-04 for longer than the time set in Q5-05. Remedy: Check suction levels; verify settings Q5-04 and Q5-05.
Sleep Active Min Water Level Sleep Mode (Water Level)	Cause: Displayed when the drive has gone to sleep because the water level has dropped below the level set in Q4-04 for longer than the time set in Q4-05. Remedy: Check water levels; verify settings Q4-04 and Q4-05.
Sleep Active Wait for Start Sleep Mode Standby	Cause: Displayed when the drive is in Sleep Mode or when the drive is waiting for the feedback level to reach the level set in P1-04, Start Level. Remedy: Wait for feedback to reach P1-04 level.
Sleep AUTO -> Off AUTO Cmd to RUN Sleep Enabled Status	Cause: Displayed when parameter P2-15 is set to 1 (Enabled) and drive has turned-off due to Sleep. Remedy: Information only.
Sleep Boost Active Sleep Mode Pressure Boost	Cause: Displayed when the drive entering Sleep Mode and the pressure setpoint is being boosted. During this time, the U1-01, Frequency Reference, monitor will be updated with the boosted setpoint. Remedy: Information only.
Staging in X sec Staging Timer Status	Cause: Displayed during multiplexing when either a drive or contactor staging is in progress. X sec indicates the time left before the staging takes place. Remedy: Information only. Wait for timer to expire.
Start Delay Adjust b1-11 Back Spin Timer Active	Cause: Displayed when the drive start is being delayed by Coast to Stop with Timer (Back Spin Timer). Remedy: This time is adjusted by parameter b1-11, Coast to Stop with Timer Time.
Start Delay Timer Active Start Delay Active	Cause: Displayed when the feedback level has reached the level set in P1-04, Start Level, and the Start Delay timer is incrementing. Remedy: Information only.
Thrust Mode Thrust Active Thrust Mode Status	Cause: Displayed during Thrust Mode. Remedy: Information only.
Utility Delay Adjust by P4-17 Utility Start Delay Status	Cause: Displayed when the drive is delaying the Run command due to the Utility Start Delay Function. Remedy: Information only. Delay controlled by P4-17.