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Fault Status: The buzzer emits a continuous beep, and the red light is on.

Possible Cause:

• Bus soft start failure.

Troubleshooting Process:

1. After system power-up, check if the bus capacitor voltage is less than 300V: If the bus voltage is low, it indicates a failure in the soft start process.

2. Check if the battery voltage is normal: Verify that the battery is within the correct voltage range and is functioning properly.

3. Check if the PV input voltage is normal: Ensure that the input voltage from the PV system is within the expected range.

4. If the battery or PV fails to soft start normally: Inspect whether the soft start circuit itself is malfunctioning.

Special Considerations:

• Pro Model:

• If the device powers on with only the PV connected and reports error code 09, it may not necessarily indicate a system crash. It could be due to low input voltage from the PV system or insufficient power being provided to the system. In this case, turn off the device, connect the battery or mains power, and then restart to see if the error is resolved.

• Non-Pro Model:

• A failure in the soft start process typically indicates a system crash. In this case, follow the error maintenance manual for troubleshooting or replace the power board if necessary.

• For Pro Models:

• If the battery is connected, but the system still shows error code 09, check the IGBT (Insulated Gate Bipolar Transistor). If it is damaged, it must be replaced.

Machine Status: The buzzer emits a continuous beep, and the red light is on.

Possible Cause:

• Transformer temperature is too high.

Issue Diagnosis:

• The internal temperature of the inverter exceeds 100°C, and the transformer temperature exceeds 150°C.

• The temperature may not necessarily exceed 100°C, as each machine has different calibration settings.

• It may not be a problem with the transformer sensor; some machines do not sample the transformer's temperature.

Troubleshooting Process:

1. Check if the fan speed is normal: Ensure the fan is operating correctly to assist with cooling.

2. Check if the transformer sensor is abnormal: Verify whether the temperature sensor is malfunctioning.

3. Consider load derating: Reduce the system load to alleviate temperature pressure.

4. Use the upper computer to check the inverter's displayed temperature: Monitor the temperature data through the system.

5. Physically touch the inverter casing: Check if the actual surface temperature of the inverter is high.

6. If the displayed temperature is high but the actual temperature is not: This may indicate an issue with the transformer’s NTC sensor.

7. Check if the dust filter is excessively clogged: Clean the filter to ensure airflow is not obstructed.

8. Check if the internal airflow paper is installed securely and completely: Ensure the cooling pathway is unobstructed for optimal airflow.