INVT GD20-UL Series Drive Fault Codes List
Complete reference list of INVT GD20-UL (North American) fault codes. Learn to troubleshoot 110V input drives, UL-compliant wiring errors, and standard vector control faults.
This guide provides the most updated reference data for to help you decipher codes like OUt, OC, and SPI on your UL-rated machinery.
INVT GD20-UL Fault Codes Reference Table
Use the search bar in the table below to quickly find your specific error code.
Goodrive20-UL Series VFD Fault Tracking
| Fault Code and Meaning | Cause and Remedy |
|---|---|
| OUt1 [1] Inverter unit U phase protection |
Cause:
The acceleration is too fast; IGBT module fault; Misacts caused by interference; Connection of driving wires is not good; Grounding is improper.
Remedy:
|
| OUt2 [2] Inverter unit V phase protection |
Cause:
The acceleration is too fast; IGBT module fault; Misacts caused by interference; Connection of driving wires is not good; Grounding is improper.
Remedy:
|
| OUt3 [3] Inverter unit W phase protection |
Cause:
The acceleration is too fast; IGBT module fault; Misacts caused by interference; Connection of driving wires is not good; Grounding is improper.
Remedy:
|
| OC1 [4] Overcurrent during acceleration |
Cause:
The acceleration is too fast; Grid voltage too low; VFD power too low; Load transients/abnormal; Grounding short circuit or output phase loss; Strong external interference; Overvoltage stall protection not open.
Remedy:
|
| OC2 [5] Overcurrent during deceleration |
Cause:
The deceleration is too fast; Grid voltage too low; VFD power too low; Load transients/abnormal; Grounding short circuit or output phase loss; Strong external interference; Overvoltage stall protection not open.
Remedy:
|
| OC3 [6] Overcurrent during constant speed running |
Cause:
Grid voltage too low; VFD power too low; Load transients/abnormal; Grounding short circuit or output phase loss; Strong external interference.
Remedy:
|
| OV1 [7] Overvoltage during acceleration |
Cause:
Input voltage is abnormal; Large energy feedback; No braking components; Braking energy is not open.
Remedy:
|
| OV2 [8] Overvoltage during deceleration |
Cause:
Input voltage is abnormal; Large energy feedback; No braking components; Braking energy is not open.
Remedy:
|
| OV3 [9] Overvoltage during constant speed running |
Cause:
Input voltage is abnormal; Large energy feedback; No braking components; Braking energy is not open.
Remedy:
|
| UV [10] Bus undervoltage |
Cause:
The voltage of the power supply is too low; The overvoltage stall protection is not open.
Remedy:
|
| OL1 [11] Motor overload |
Cause:
Power supply voltage too low; Motor rated current setting incorrect; Motor stall or load transients too strong.
Remedy:
|
| OL2 [12] VFD overload |
Cause:
Acceleration too fast; Resetting rotating motor; Power supply voltage too low; Load too heavy; Close loop vector control reverse direction/long low-speed operation.
Remedy:
|
| SPI [13] Phase loss on input side |
Cause:
Phase loss or fluctuation of input R,S,T.
Remedy:
|
| SPO [14] Phase loss on output side |
Cause:
U,V,W phase loss input (or serious asymmetrical three phase of the load).
Remedy:
|
| OH1 [15] Rectifier module overheat |
Cause:
Air duct jam or fan damage; Ambient temperature is too high; The time of overload running is too long.
Remedy:
|
| OH2 [16] Inverter module overheat |
Cause:
Air duct jam or fan damage; Ambient temperature is too high; The time of overload running is too long.
Remedy:
|
| EF [17] External fault |
Cause:
SI external fault input terminals action.
Remedy:
|
| CE [18] 485 communication fault |
Cause:
Baud rate setting incorrect; Fault in communication wiring; Communication address wrong; Strong interference.
Remedy:
|
| ItE [19] Current detection fault |
Cause:
Control panel connector poor contact; Exception on the magnifying circuit.
Remedy:
|
| tE [20] Motor autotuning fault |
Cause:
Motor capacity not compatible with VFD; Rated parameter of motor not set correctly; Offset parameters huge; Autotune overtime.
Remedy:
|
| EEP [21] EEPROM operation fault |
Cause:
Error of controlling the write and read of parameters; Damage to EEPROM.
Remedy:
|
| PIDE [22] PID feedback offline fault |
Cause:
PID feedback offline; PID feedback source disappear.
Remedy:
|
| bCE [23] Braking unit fault |
Cause:
Braking circuit fault or damage to braking pipes; External braking resistor not sufficient.
Remedy:
|
| END [24] Running time reached |
Cause:
The actual running time of the VFD is above the internal setting running time.
Remedy:
|
| OL3 [25] Electronic overload |
Cause:
The VFD will report overload pre-alarm according to the set value.
Remedy:
|
| PCE [26] Keypad communication error |
Cause:
Keypad not in good connection or offline; Keypad cable too long or strong interference; Keypad/Main board circuit fault.
Remedy:
|
| UPE [27] Parameter upload error |
Cause:
Keypad not in good connection or offline; Keypad cable too long or strong interference; Communication circuit fault.
Remedy:
|
| DNE [28] Parameter download error |
Cause:
Keypad not in good connection or offline; Keypad cable too long/interference; Data storage error in keypad.
Remedy:
|
| ETH1 [32] To-ground short-circuit fault 1 |
Cause:
Output of VFD is short circuited with ground; Fault in current detection circuit; Great difference between motor power setting and VFD power.
Remedy:
|
| ETH2 [33] To-ground short-circuit fault 2 |
Cause:
Output of VFD is short circuited with ground; Fault in current detection circuit; Great difference between motor power setting and VFD power.
Remedy:
|
| dEu [34] Speed deviation fault |
Cause:
Load is too heavy, or stall occurred.
Remedy:
|
| STo [35] Mal-adjustment fault |
Cause:
Control parameters of synchronous motor are set improperly; Autotuning parameter inaccurate; VFD not connected to motor.
Remedy:
|
| LL [36] Electronic underload fault |
Cause:
The VFD will report the underload pre-alarm according to the set value.
Remedy:
|
| PoFF System power off |
Cause:
System power off or low DC voltage.
Remedy:
|
Troubleshooting 110V & UL Specific Issues
The GD20-UL is often used in markets with 110V power, which presents unique challenges for DC bus stability.
- Low Voltage Trips (Lu): On 110V models, the drive uses a voltage doubler circuit to create a 300V+ DC bus. If your input line sags even slightly under load, the drive may trip on Undervoltage (Lu) or Input Phase Loss (SPI) more easily than 220V/480V models.
- UL Compliance Wiring: Many “Electrical Faults” (like Ground Fault ETH) in North America are actually caused by improper neutral-to-ground bonding in the sub-panel. Ensure the drive’s ground is isolated from the neutral at the device to prevent nuisance tripping.
- Fault History: Press SHIFT (>>) repeatedly when a fault is displayed to see the Bus Voltage at the time of the trip.
- For 110V/220V drives, a bus voltage >400V indicates an Overvoltage trip.
- For 480V drives, a bus voltage >800V indicates an Overvoltage trip.
Frequently Asked Questions (FAQ)
Q: I am inputting 110V, but the drive shows “SPI” (Input Phase Loss). Why?
A: SPI monitors the input power stability. On 110V (Single Phase) units, verify that you are connected to terminals L1 and L2/N.
Fix: Check
if the input voltage drops below 95V when the motor starts. If the
supply is too weak (long extension cords), the drive will trip to
protect its internal doubler circuit.
Q: What is the “STO” code?
A: STO stands for Safe Torque Off. This is a safety status, not a failure. It means the safety jumper between +24V and H1/H2 (or STO terminals) is missing or the external E-Stop button is pressed. The drive will not start until this circuit is closed.
Q: How do I reset a “OL1” (Overload) on a GD20-UL?
A: OL1 means the motor is drawing more current than the value set in parameter P02.05 (Rated Current).
1. Check if the motor is mechanically jammed.
2. Verify P02.05 matches the motor nameplate (FLA).
3. Press STOP/RST to reset.
Note: According
to UL regulations, if the drive trips on OL1, you must inspect the
motor and cables for insulation damage before restarting.
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