Fault Name

Reason of Fault

Handling Suggestions

Inverter NTC Fault

The inverter’s working environment temperature is too high or too low.

• If temperature is too high: Lower the ambient temperature or turn off the inverter for 15 minutes, then restart. Ensure installation follows the user manual guidelines.
• If temperature is too low: Do not attempt to start the inverter. Contact after-sales service immediately.

Grid Frequency Fault

The inverter detects that the grid frequency is outside the normal range specified by safety regulations.

• Verify that the safety country setting on the inverter is correct.
• Check if the AC frequency (Freq) is within the acceptable range.
• If the issue is rare and resolves quickly, it may be due to occasional grid instability.

Grid Voltage Fault

The inverter detects that the AC voltage is outside the normal range required by safety regulations.

• Make sure the safety country setting of the inverter is correct.
• Use a multimeter to check whether the AC voltage between the L line and N line is within the normal range.
• If the AC voltage is too low, ensure the AC cable is properly connected and that the jacket is not compressed into the AC terminal. Also, ensure the cable is correctly sized
• Make sure the grid voltage in your area is stable.

PV Voltage Fault

The inverter has detected that the PV voltage is outside the normal range of the rated requirements.

• Turn off the PV switch and use a multimeter to check whether the open circuit voltage of the panel is below 600V.
• If the voltage is too high, reduce the number of connected panels to lower the input voltage.

DCI High

The inverter has detected a high DC component in the AC output.

• Try restarting the inverter and check if the fault still exists.
• If the fault persists, contact after-sales service immediately.

Current Leak High

A ground fault may be caused by improper AC side N-line connection or high humidity.

• Use a multimeter to check the voltage between the inverter and the grounded frame. The voltage should be close to 0V.
• If voltage is detected, check that the N wire and ground wire on the AC side are properly connected.
• If this failure occurs in the early morning, dawn, or rainy days, it may be due to temporary high humidity and should resolve on its own.

PV Isolation Fault

Possible poor grounding of photovoltaic panels, aging PV panels, damaged DC cables, or high humidity.

• Use a multimeter to check that the resistance between the inverter and the grounded frame is close to zero. If not, check the system wiring.
• If humidity is too high, isolation failure may occur temporarily.
• Check the resistance of PV1+/PV2+/BAT+/PV- to ground. If it is below 30kΩ, verify system wiring.
• Restart the inverter and check if the fault still exists. If the issue persists, contact after-sales service.

No Utility

The inverter does not detect grid information.

• Use a multimeter to check whether there is voltage on the AC side.
• Ensure the grid voltage is normal.
• Check that the AC cable is firmly connected and not loose.
• If everything is fine, try disconnecting the AC circuit breaker and reconnecting it after 5 minutes.

Bus Over Voltage

The internal BUS voltage is out of range.

• Restart the inverter and check if the issue persists.
• If the fault still exists, contact after-sales service.

DSP Communication Fault

Caused by strong external magnetic field interference.

• Restart the inverter.
• If the fault persists, contact after-sales service.

Hall Sensor Fault

HCT detection failure in the system.

• Contact after-sales service.

GFCI Fault

Abnormal Ground Fault Circuit Interrupter (GFCI) detection.

• Contact after-sales service.

Relay Fault

The neutral and ground wires on the AC side are not properly connected or are intermittently faulty.

• Check with a multimeter whether the voltage between N and ground is below 10V.
• If voltage is higher, confirm that the N and ground wires are correctly connected.
• Restart the inverter if necessary.

EEPROM Fault

Caused by external strong magnetic field interference.

• Restart the inverter and check if the issue persists.
• If unresolved, contact after-sales service.

Consistent Fault

The internal programs of the system do not match.

• Restart the inverter.
• If the fault persists, contact after-sales service.

ARM Communication Fault

Caused by strong external magnetic field interference.

• Restart the inverter.
• If the fault persists, contact after-sales service.

Back-Up Overload Fault

Total backup load exceeds the rated output power.

• Reduce the off-grid loads to keep total power below the rated output.

BMS Comm Fault

The inverter and lithium-ion battery communication is abnormal.

• Power off the inverter and check the BMS cable connection.
• If unresolved, contact after-sales service.

Bat Volt Low

Lithium battery voltage is below 196V. Lead-acid battery voltage is below (LV-cell × 1V).

• Confirm that the battery connection cable is securely attached.
• Ensure that the battery is switched on and the LED is lit.
• Check that the battery is not over-discharged. If it is, activate battery in the inverter settings to recover the battery after power replenishment.
• If the issue persists, contact the dealer or after-sales service.

Bus Unbalance Fault

The positive and negative BUS voltage difference exceeds 70V.

• Contact after-sales service.

Meter Comm Loss

The inverter is not communicating properly with the meter.

• Check that the meter and inverter are correctly connected.
• Ensure that the RX/TX communication lines are not reversed.

Battery Need Charge

The battery voltage is too low to discharge.

• Use the Portal to force charge the battery until SOC is above 4%.